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  • 301.
    Carva, Karel
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Battiato, Marco
    Oppeneer, Peter M.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Ab Initio Investigation of the Elliott-Yafet Electron-Phonon Mechanism in Laser-Induced Ultrafast Demagnetization2011Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, nr 20, s. 207201-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The spin-flip (SF) Eliashberg function is calculated from first principles for ferromagnetic Ni to accurately establish the contribution of Elliott-Yafet electron-phonon SF scattering to Ni's femtosecond laser-driven demagnetization. This is used to compute the SF probability and demagnetization rate for laser-created thermalized as well as nonequilibrium electron distributions. Increased SF probabilities are found for thermalized electrons, but the induced demagnetization rate is extremely small. A larger demagnetization rate is obtained for nonequilibrium electron distributions, but its contribution is too small to account for femtosecond demagnetization.

  • 302.
    Ceruti, S.
    et al.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Camera, F.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Bracco, A.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Avigo, R.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Benzoni, G.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Blasi, N.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Bocchi, G.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Bottoni, S.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Brambilla, S.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Crespi, F. C. L.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Giaz, A.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Leoni, S.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Mentana, A.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Million, B.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Morales, A. I.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Nicolini, R.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Pellegri, L.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Pullia, A.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Riboldi, S.
    Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.;Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Wieland, O.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Birkenbach, B.
    Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
    Bazzacco, D.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Ciemala, M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Desesquelles, P.
    CNRS IN2P3, CSNSM, F-91405 Orsay, France.;Univ Paris 11, F-91405 Orsay, France..
    Eberth, J.
    Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
    Farnea, E.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Goergen, A.
    Ctr CEA Saclay, CEA DSM, IRFU, F-91191 Gif Sur Yvette, France.;Univ Oslo, Dept Phys, N-0316 Oslo, Norway..
    Gottardo, A.
    Univ Padua, Dipartmento Fis, I-35131 Padua, Italy.;Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Hess, H.
    Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
    Judson, D. S.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England..
    Jungclaus, A.
    CSIC, Inst Estruct Mat, E-28006 Madrid, Spain..
    Kmiecik, M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Korten, W.
    Maj, A.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Menegazzo, R.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Mengoni, D.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartmento Fis, I-35131 Padua, Italy..
    Michelagnoli, C.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartmento Fis, I-35131 Padua, Italy..
    Modamio, V.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Montanari, D.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartmento Fis, I-35131 Padua, Italy..
    Myalski, S.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Napoli, D.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Quintana, B.
    Univ Salamanca, Lab Radiaciones Ionizantes, E-37008 Salamanca, Spain..
    Reiter, P.
    Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
    Recchia, F.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartmento Fis, I-35131 Padua, Italy..
    Rosso, D.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Sahin, E.
    Univ Oslo, Dept Phys, N-0316 Oslo, Norway.;Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Salsac, M. D.
    Ctr CEA Saclay, CEA DSM, IRFU, F-91191 Gif Sur Yvette, France..
    Söderström, P. -A
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Stezowski, O.
    Univ Lyon 1, CNRS, Inst Phys Nucl Lyon, IN2P3, F-69622 Villeurbanne, France..
    Theisen, Ch.
    Ctr CEA Saclay, CEA DSM, IRFU, F-91191 Gif Sur Yvette, France..
    Ur, C.
    Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
    Valiente-Dobon, J. J.
    Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
    Zieblinski, M.
    Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland..
    Isospin Mixing in Zr-80: From Finite to Zero Temperature2015Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, nr 22, artikkel-id 222502Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The isospin mixing was deduced in the compound nucleus Zr-80 at an excitation energy of E* = 54 MeV from the gamma decay of the giant dipole resonance. The reaction Ca-40 + Ca-40 at E-beam = 136 MeV was used to form the compound nucleus in the isospin I = 0 channel, while the reaction Cl-37 + Ca-44 at E-beam = 95 MeV was used as the reference reaction. The. rays were detected with the AGATA demonstrator array coupled with LaBr3:Ce detectors. The temperature dependence of the isospin mixing was obtained and the zero-temperature value deduced. The isospin-symmetry-breaking correction delta(C) used for the Fermi superallowed transitions was extracted and found to be consistent with beta-decay data.

  • 303. Chatterjee, A.
    et al.
    Navin, A.
    Shrivastava, A.
    Bhattacharyya, S.
    Rejmund, M.
    Keeley, N.
    Nanal, V.
    Nyberg, J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Pillay, R. G.
    Ramachandran, K.
    Stefan, I.
    Bazin, D.
    Beaumel, D.
    Blumenfeld, Y.
    de France, G.
    Gupta, D.
    Labiche, M.
    Lemasson, A.
    Lemmon, R.
    Raabe, R.
    Scarpaci, J. A.
    Simenel, C.
    Timis, C.
    1n and 2n transfer with the borromean nucleus He-6 near the Coulomb barrier2008Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, nr 3, s. 032701-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Angular distributions for In and 2n transfer are reported for the He-6 + Cu-65 system at E-lab = 22.6 MeV. For the first time, triple coincidences between a particles, neutrons, and characteristic gamma rays from the targetlike residues were used to separate the contributions arising from In and 2n transfer. The differential cross sections for these channels, elastic scattering, and fusion were analyzed using a coupled reaction channels approach. The large measured ratio of the 2n-to-1n cross section and the strong influence of 2n transfer on other channels indicate that the dineutron configuration of He-6 plays a dominant role in the reaction mechanism.

  • 304. Chen, L. -J
    et al.
    Wang, S.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;Univ Maryland, Dept Astron, College Pk, MD 20747 USA.
    Wilson, L. B. , I I I
    Schwartz, S.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80305 USA.
    Bessho, N.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;Univ Maryland, Dept Astron, College Pk, MD 20747 USA.
    Moore, T.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Gershman, D.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Giles, B.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Malaspina, D.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80305 USA.
    Wilder, F. D.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80305 USA.
    Ergun, R. E.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80305 USA.
    Hesse, M.
    Univ Bergen, N-5020 Bergen, Norway.
    Lai, H.
    Univ Calif Los Angeles, Los Angeles, CA 90095 USA.
    Russell, C.
    Univ Calif Los Angeles, Los Angeles, CA 90095 USA.
    Strangeway, R.
    Univ Calif Los Angeles, Los Angeles, CA 90095 USA.
    Torbert, R. B.
    Southwest Res Inst, San Antonio, TX 78238 USA.
    Vinas, A. F.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Burch, J.
    Southwest Res Inst, San Antonio, TX 78238 USA.
    Lee, S.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Pollock, C.
    Denali Sci, Healy, AK 99743 USA.
    Dorelli, J.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Paterson, W.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
    Ahmadi, N.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80305 USA.
    Goodrich, K.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80305 USA.
    Lavraud, B.
    Univ Toulouse UPS, Inst Rech Astrophys & Planetol, CNRS, CNES, F-31028 Toulouse 4, France.
    Le Contel, O.
    Univ Paris Sud, Observ Paris, Lab Phys Plasmas, UMR7648,CNRS,Ecole Polytech,Sorbonne Univ, F-91128 Palaiseau, France.
    Khotyaintsev, Yuri V.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Lindqvist, P. -A
    Boardsen, S.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;Univ Maryland, Dept Astron, College Pk, MD 20747 USA.
    Wei, H.
    Univ Calif Los Angeles, Los Angeles, CA 90095 USA.
    Le, A.
    Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
    Avanov, L.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;Univ Maryland, Dept Astron, College Pk, MD 20747 USA.
    Electron Bulk Acceleration and Thermalization at Earth's Quasiperpendicular Bow Shock2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, nr 22, artikkel-id 225101Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Electron heating at Earth's quasiperpendicular bow shock has been surmised to be due to the combined effects of a quasistatic electric potential and scattering through wave-particle interaction. Here we report the observation of electron distribution functions indicating a new electron heating process occurring at the leading edge of the shock front. Incident solar wind electrons are accelerated parallel to the magnetic field toward downstream, reaching an electron-ion relative drift speed exceeding the electron thermal speed. The bulk acceleration is associated with an electric field pulse embedded in a whistler-mode wave. The high electron-ion relative drift is relaxed primarily through a nonlinear current-driven instability. The relaxed distributions contain a beam traveling toward the shock as a remnant of the accelerated electrons. Similar distribution functions prevail throughout the shock transition layer, suggesting that the observed acceleration and thermalization is essential to the cross-shock electron heating.

  • 305.
    Chen, Z.
    et al.
    Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
    Higley, D. J.
    Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA.
    Beye, M.
    DESY, Dept Photon Sci, Notkestr 85, D-22607 Hamburg, Germany.
    Hantschmann, M.
    Helmholtz Zentrum Berlin, Dept Mat & Energy Sci, D-14109 Berlin, Germany.
    Mehta, V
    HGST, San Jose Res Ctr, San Jose, CA 95135 USA.
    Hellwig, O.
    Tech Univ Chemnitz, Inst Phys, D-09107 Chemnitz, Germany;Helmholtz Zentrum Dresden Rossendorf, Inst Ion Beam Phys & Mat Res, D-01328 Dresden, Germany.
    Mitra, A.
    SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA;Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England.
    Bonetti, S.
    Stockholm Univ, Dept Phys, S-10691 Stockholm, Sweden.
    Bucher, M.
    SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
    Carron, S.
    SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
    Chase, T.
    Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA.
    Jal, E.
    SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
    Kukreja, R.
    Univ Calif Davis, Dept Mat Sci & Engn, Davis, CA 95616 USA.
    Liu, T.
    Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
    Reid, A. H.
    SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
    Dakovski, G. L.
    SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
    Foehlisch, A.
    Helmholtz Zentrum Berlin, Dept Mat & Energy Sci, D-14109 Berlin, Germany.
    Schlotter, W. F.
    SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
    Dürr, Hermann
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, FREIA. SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA.
    Stöhr, J.
    SLAC Natl Accelerator Lab, Stanford, CA 94035 USA;Dept Photon Sci, Stanford, CA 94035 USA.
    Ultrafast Self-Induced X-Ray Transparency and Loss of Magnetic Diffraction2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, nr 13, artikkel-id 137403Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using ultrafast similar or equal to 2.5 fs and similar or equal to 25 fs self-amplified spontaneous emission pulses of increasing intensity and a novel experimental scheme, we report the concurrent increase of stimulated emission in the forward direction and loss of out-of-beam diffraction contrast for a Co/Pd multilayer sample. The experimental results are quantitatively accounted for by a statistical description of the pulses in conjunction with the optical Bloch equations. The dependence of the stimulated sample response on the incident intensity, coherence time, and energy jitter of the employed pulses reveals the importance of increased control of x-ray free electron laser radiation.

  • 306.
    Chimata, Raghuveer
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Bergman, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Bergqvist, Lars
    Sanyal, Biplab
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Eriksson, Olle
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Microscopic Model for Ultrafast Remagnetization Dynamics2012Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, nr 15, s. 157201-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this Letter, we provide a microscopic model for the ultrafast remagnetization of atomic moments already quenched above the Stoner-Curie temperature by a strong laser fluence. Combining first-principles density functional theory, atomistic spin dynamics utilizing the Landau-Lifshitz-Gilbert equation, and a three-temperature model, we analyze the temporal evolution of atomic moments as well as the macroscopic magnetization of bcc Fe and hcp Co covering a broad time scale, ranging from femtoseconds to picoseconds. Our simulations show a variety of complex temporal behavior of the magnetic properties resulting from an interplay between electron, spin, and lattice subsystems, which causes an intricate time evolution of the atomic moment, where longitudinal and transversal fluctuations result in a macrospin moment that evolves highly nonmonotonically.

  • 307.
    Chiodaroli, Marco
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik. Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA.
    Gunaydin, M.
    Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA;Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA.
    Johansson, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik. Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA;Stockholm Univ, Nordita, Roslagstullsbacken 23, S-10691 Stockholm, Sweden;KTH Royal Inst Technol, S-10691 Stockholm, Sweden.
    Roiban, R.
    Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA;Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA.
    Gauged Supergravities and Spontaneous Supersymmetry Breaking from the Double Copy Construction2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, nr 17, artikkel-id 171601Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Supergravities with gauged R symmetry and Minkowski vacua allow for spontaneous supersymmetry breaking and, as such, provide a framework for building supergravity models of phenomenological relevance. In this Letter, we initiate the study of double copy constructions for these supergravities. We argue that, on general grounds, we expect their scattering amplitudes to be described by a double copy of the type (spontaneously broken gauge theory)circle times (gauge theory with broken supersymmetry). We present a simple realization in which the resulting supergravity has U(1)(R) gauge symmetry, spontaneously broken N = 2 supersymmetry, and massive gravitini. This is the first instance of a double copy construction of a gauged supergravity and of a theory with spontaneously broken supersymmetry. The construction extends in a straightforward manner to a large family of gauged Yang-Mills-Einstein supergravity theories with or without spontaneous gauge-symmetry breaking.

  • 308. Chiodaroli, Marco
    et al.
    Gunaydin, Murat
    Johansson, Henrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Teoretisk fysik.
    Roiban, Radu
    Complete construction of magical, symmetric and homogeneous N=2 supergravities as double copies of gauge theories2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 1, artikkel-id 011603Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We show that scattering amplitudes in magical, symmetric or homogeneous N=2 Maxwell-Einstein supergravities can be obtained as double copies of two gauge theories, using the framework of color/kinematics duality. The left-hand-copy is N=2 super-Yang-Mills theory coupled to a hypermultiplet, whereas the right-hand-copy is a non-supersymmetric theory that can be identified as the dimensional reduction of a D-dimensional Yang-Mills theory coupled to P fermions. For generic D and P, the double copy gives homogeneous supergravities. For P=1 and D=7,8,10,14, it gives the magical supergravities. We compute explicit amplitudes, discuss their soft limit and study the UV-behavior at one loop.

  • 309. Choudhury, D.
    et al.
    Mandal, P.
    Mathieu, Roland
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Hazarika, A.
    Rajan, S.
    Sundaresan, A.
    Waghmare, U. V.
    Knut, Ronny
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Yt- och gränsskiktsvetenskap.
    Karis, Olof
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Yt- och gränsskiktsvetenskap.
    Nordblad, Per
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Sarma, Dipankar Das
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Near-Room-Temperature Colossal Magnetodielectricity and Multiglass Properties in Partially Disordered La2NiMnO62012Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, nr 12, s. 127201-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report magnetic, dielectric, and magnetodielectric responses of the pure monoclinic bulk phase of partially disordered La2NiMnO6, exhibiting a spectrum of unusual properties and establish that this compound is an intrinsically multiglass system with a large magnetodielectric coupling (8%-20%) over a wide range of temperatures (150-300 K). Specifically, our results establish a unique way to obtain colossal magnetodielectricity, independent of any striction effects, by engineering the asymmetric hopping contribution to the dielectric constant via the tuning of the relative-spin orientations between neighboring magnetic ions in a transition-metal oxide system. We discuss the role of antisite (Ni-Mn) disorder in emergence of these unusual properties.

  • 310.
    Chung, Sunjae
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi. Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden;KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, S-16440 Kista, Sweden.
    Le, Q. Tuan
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden;KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, S-16440 Kista, Sweden.
    Ahlberg, Martina
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden;NanOsc AB, S-16440 Kista, Sweden.
    Awad, Ahmad A.
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden;NanOsc AB, S-16440 Kista, Sweden.
    Weigand, Markus
    Max Planck Inst Intelligent Syst, D-70569 Stuttgart, Germany.
    Bykova, Iuliia
    Max Planck Inst Intelligent Syst, D-70569 Stuttgart, Germany.
    Khymyn, Roman
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden.
    Dvornik, Mykola
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden.
    Mazraati, Hamid
    KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, S-16440 Kista, Sweden;NanOsc AB, S-16440 Kista, Sweden.
    Houshang, Afshin
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden;NanOsc AB, S-16440 Kista, Sweden.
    Jiang, Sheng
    KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, S-16440 Kista, Sweden.
    Anh Nguyen, T. N.
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden;KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, S-16440 Kista, Sweden;Vietnam Acad Sci & Technol, Inst Mat Sci, Lab Magnetism & Superconduct, 18 Hoang Quoc Viet, Hanoi 122300, Vietnam.
    Goering, Eberhard
    Max Planck Inst Intelligent Syst, D-70569 Stuttgart, Germany.
    Schuetz, Gisela
    Max Planck Inst Intelligent Syst, D-70569 Stuttgart, Germany.
    Gräfe, Joachim
    Max Planck Inst Intelligent Syst, D-70569 Stuttgart, Germany.
    Åkerman, Johan
    Univ Gothenburg, Dept Phys, S-41296 Gothenburg, Sweden;KTH Royal Inst Technol, Sch Engn Sci, Dept Appl Phys, S-16440 Kista, Sweden;NanOsc AB, S-16440 Kista, Sweden.
    Direct Observation of Zhang-Li Torque Expansion of Magnetic Droplet Solitons2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, nr 21, artikkel-id 217204Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Magnetic droplets are nontopological dynamical soli tons that can be nucleated in nanocontact based spin torque nano-oscillators (STNOs) with perpendicular magnetic anisotropy free layers. While theory predicts that the droplet should be of the same size as the nanocontact, its inherent drift instability has thwarted attempts at observing it directly using microscopy techniques. Here, we demonstrate highly stable magnetic droplets in all-perpendicular STNOs and present the first detailed droplet images using scanning transmission X-ray microscopy. In contrast to theoretical predictions, we find that the droplet diameter is about twice as large as the nanocontact. By extending the original droplet theory to properly account for the lateral current spread underneath the nanocontact, we show that the large discrepancy primarily arises from current-in-plane Zhang-Li torque adding an outward pressure on the droplet perimeter. Electrical measurements on droplets nucleated using a reversed current in the antiparallel state corroborate this picture.

  • 311.
    Colarieti-Tosti, M.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Simak, S. I.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Ahuja, Rajeev
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Nordström, Lars
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Eriksson, Olle
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Åberg, Daniel
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Kondenserade materiens teori (Fysik IV).
    Edvardsson, S.
    Brooks, Michael S. S.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Origin of Magnetic Anisotropy of Gd Metal2003Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 91, nr 15, s. 157201-157204Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using first-principles theory, we have calculated the energy of Gd as a function of spin direction, θ, between the c and a axes and found good agreement with experiment for both the total magnetic anisotropy energy and its angular dependence. The calculated low temperature direction of the magnetic moment lies at an angle of 20° to the c axis. The calculated magnetic anisotropy energy of Gd metal is due to a unique mechanism involving a contribution of 7.5  μeV from the classical dipole-dipole interaction between spins plus a contribution of 16  μeV due to the spin-orbit interaction of the conduction electrons. The 4f spin polarizes the conduction electrons via exchange interaction, which transfers the magnetic anisotropy of the conduction electrons to the 4f spin.

  • 312.
    Cornils, L.
    et al.
    Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany..
    Kamlapure, A.
    Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany..
    Zhou, L.
    Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany.;Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany..
    Pradhan, Saurabh
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Khajetoorians, A. A.
    Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany.;Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands..
    Fransson, Jonas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Wiebe, J.
    Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany..
    Wiesendanger, R.
    Univ Hamburg, Dept Phys, D-20355 Hamburg, Germany..
    Spin-Resolved Spectroscopy of the Yu-Shiba-Rusinov States of Individual Atoms2017Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, nr 19, artikkel-id 197002Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A magnetic atom in a superconducting host induces so-called Yu-Shiba-Rusinov (YSR) bound states inside the superconducting energy gap. By combining spin-resolved scanning tunneling spectroscopy with simulations we demonstrate that the pair of peaks associated with the YSR states of an individual Fe atom coupled to an oxygen-reconstructed Ta surface gets spin polarized in an external magnetic field. As theoretically predicted, the electron and hole parts of the YSR states have opposite signs of spin polarizations which keep their spin character when crossing the Fermi level through the quantum phase transition. The simulation of a YSR state right at the Fermi level reveals zero spin polarization which can be used to distinguish such states from Majorana zero modes in chains of YSR atoms.

  • 313. Crespi, F. C. L.
    et al.
    Bracco, A.
    Nicolini, R.
    Mengoni, D.
    Pellegri, L.
    Lanza, E. G.
    Leoni, S.
    Maj, A.
    Kmiecik, M.
    Avigo, R.
    Benzoni, G.
    Blasi, N.
    Boiano, C.
    Bottoni, S.
    Brambilla, S.
    Camera, F.
    Ceruti, S.
    Giaz, A.
    Million, B.
    Morales, A. I.
    Vandone, V.
    Wieland, O.
    Bednarczyk, P.
    Ciemala, M.
    Grebosz, J.
    Krzysiek, M.
    Mazurek, K.
    Zieblinski, M.
    Bazzacco, D.
    Bellato, M.
    Birkenbach, B.
    Bortolato, D.
    Calore, E.
    Cederwall, B.
    Charles, L.
    de Angelis, G.
    Desesquelles, P.
    Eberth, J.
    Farnea, E.
    Gadea, A.
    Gorgen, A.
    Gottardo, A.
    Isocrate, R.
    Jolie, J.
    Jungclaus, A.
    Karkour, N.
    Korten, W.
    Menegazzo, R.
    Michelagnoli, C.
    Molini, P.
    Napoli, D. R.
    Pullia, A.
    Recchia, F.
    Reiter, P.
    Rosso, D.
    Sahin, E.
    Salsac, M. D.
    Siebeck, B.
    Siem, S.
    Simpson, J.
    Soderstrom, P. -A
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Stezowski, O.
    Theisen, Ch.
    Ur, C.
    Valiente-Dobon, J. J.
    Isospin Character of Low-Lying Pygmy Dipole States in Pb-208 via Inelastic Scattering of O-17 Ions2014Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, nr 1, s. 012501-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The properties of pygmy dipole states in Pb-208 were investigated using the Pb-208(O-17, O-17'gamma) reaction at 340 MeV and measuring the gamma decay with high resolution with the AGATA demonstrator array. Cross sections and angular distributions of the emitted gamma rays and of the scattered particles were measured. The results are compared with (gamma, gamma') and (p, p') data. The data analysis with the distorted wave Born approximation approach gives a good description of the elastic scattering and of the inelastic excitation of the 2(+) and 3(-) states. For the dipole transitions a form factor obtained by folding a microscopically calculated transition density was used for the first time. This has allowed us to extract the isoscalar component of the 1(-) excited states from 4 to 8 MeV.

  • 314.
    Cricchio, Francesco
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
    Bultmark, Fredrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
    Grånäs, Oscar
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
    Nordström, Lars
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
    Itinerant Magnetic Multipole Moments of Rank Five as the Hidden Order in URu2Si22009Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, nr 10, s. 107202-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A broken symmetry ground state without any magnetic moments has been   calculated by means of the local-density approximation to density   functional theory plus a local exchange term, the so-called LDA+U   approach, for URu2Si2. The solution is analyzed in terms of a multipole   tensor expansion of the itinerant density matrix and is found to be a   nontrivial magnetic multipole. Analysis and further calculations show   that this type of multipole enters naturally in time reversal breaking   in the presence of large effective spin-orbit coupling and coexists   with magnetic moments for most magnetic actinides.

  • 315. Cryan, James P.
    et al.
    Glownia, J. M.
    Andreasson, Jakob
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Belkacem, A.
    Berrah, N.
    Blaga, C. I.
    Bostedt, C.
    Bozek, J.
    Buth, C.
    DiMauro, L. F.
    Fang, L.
    Gessner, O.
    Guehr, M.
    Hajdu, Janos
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Hertlein, M. P.
    Hoener, M.
    Kornilov, O.
    Marangos, J. P.
    March, A. M.
    McFarland, B. K.
    Merdji, H.
    Petrovic, V. S.
    Raman, C.
    Ray, D.
    Reis, D.
    Tarantelli, F.
    Trigo, M.
    White, J. L.
    White, W.
    Young, L.
    Bucksbaum, P. H.
    Coffee, R. N.
    Auger Electron Angular Distribution of Double Core-Hole States in the Molecular Reference Frame2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, nr 8, s. 083004-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The Linac Coherent Light Source free electron laser is a source of high brightness x rays, 2×1011 photons in a ∼5  fs pulse, that can be focused to produce double core vacancies through rapid sequential ionization. This enables double core vacancy Auger electron spectroscopy, an entirely new way to study femtosecond chemical dynamics with Auger electrons that probe the local valence structure of molecules near a specific atomic core. Using 1.1 keV photons for sequential x-ray ionization of impulsively aligned molecular nitrogen, we observed a rich single-site double core vacancy Auger electron spectrum near 413 eV, in good agreement with ab initio calculations, and we measured the corresponding Auger electron angle dependence in the molecular frame.

  • 316. Czerwinski, E.
    et al.
    Moskal, P.
    Grzonka, D.
    Czyzykiewicz, R.
    Gil, D.
    Kamys, B.
    Khoukaz, A.
    Klaja, J.
    Klaja, P.
    Krzemien, W.
    Oelert, W.
    Ritman, J.
    Sefzick, T.
    Siemaszko, M.
    Silarski, M.
    Smyrski, J.
    Täschner, A.
    Wolke, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi.
    Wuestner, P.
    Zdebik, J.
    Zielinski, M.
    Zipper, W.
    Determination of the Total Width of the η Meson2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, nr 12, s. 122001-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Taking advantage of both the low-emittance proton beam of the cooler synchrotron COSYand the high momentum precision of the COSY-11 detector system, the mass distribution of the eta' meson was measured with a resolution of 0: 33 MeV/c(2) (FWHM), improving the experimental mass resolution by almost an order of magnitude with respect to previous results. Based on the sample of more than 2300 reconstructed pp -> pp eta' events, the total width of the eta' meson was determined to be Gamma(eta') = 0.226 +/- 0: 017(stat) +/- 0: 014(syst) MeV/c(2).

  • 317. Czerwinski, E.
    et al.
    Moskal, P.
    Silarski, M.
    Bass, S. D.
    Grzonka, D.
    Kamys, B.
    Khoukaz, A.
    Klaja, J.
    Krzemien, W.
    Oelert, W.
    Ritman, J.
    Sefzick, T.
    Smyrski, J.
    Taeschner, A.
    Wolke, Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Zielinski, M.
    Determination of the eta '-Proton Scattering Length in Free Space2014Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, nr 6, s. 062004-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Taking advantage of both the high mass resolution of the COSY-11 detector and the high energy resolution of the low-emittance proton beam of the cooler synchrotron COSY, we determine the excitation function for the pp --> pp eta' reaction close to threshold. Combining these data with previous results, we extract the scattering length for the eta'-proton potential in free space to be Re(alpha(p eta)') = 0 +/- 0.43 fm and Im(alpha(p eta)') = 0.37(-0.16)(+0.40) fm.

  • 318. Deca, J.
    et al.
    Divin, Andrey
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Lapenta, G.
    Lembege, B.
    Markidis, S.
    Horanyi, M.
    Electromagnetic Particle-in-Cell Simulations of the Solar Wind Interaction with Lunar Magnetic Anomalies2014Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, nr 15, s. 151102-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We present the first three-dimensional fully kinetic and electromagnetic simulations of the solar wind interaction with lunar crustal magnetic anomalies (LMAs). Using the implicit particle-in-cell code IPIC3D, we confirm that LMAs may indeed be strong enough to stand off the solar wind from directly impacting the lunar surface forming a mini-magnetosphere, as suggested by spacecraft observations and theory. In contrast to earlier magnetohydrodynamics and hybrid simulations, the fully kinetic nature of IPIC3D allows us to investigate the space charge effects and in particular the electron dynamics dominating the near-surface lunar plasma environment. We describe for the first time the interaction of a dipole model centered just below the lunar surface under plasma conditions such that only the electron population is magnetized. The fully kinetic treatment identifies electromagnetic modes that alter the magnetic field at scales determined by the electron physics. Driven by strong pressure anisotropies, the mini-magnetosphere is unstable over time, leading to only temporal shielding of the surface underneath. Future human exploration as well as lunar science in general therefore hinges on a better understanding of LMAs.

  • 319.
    Deca, Jan
    et al.
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.;NASA, SSERVI, Inst Modeling Plasma Atmospheres & Cosm Dus, Moffett Field, CA 94035 USA..
    Divin, Andrey
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen. St Petersburg State Univ, Phys Dept, St Petersburg 198504, Russia.
    Henri, Pierre
    CNRS, LPC2E, F-45071 Orleans, France..
    Eriksson, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Markidis, Stefano
    KTH Royal Inst Technol, S-10044 Stockholm, Sweden..
    Olshevsky, Vyacheslav
    Katholieke Univ Leuven, Ctr Math Plasma Astrophys CmPA, B-3001 Leuven, Belgium..
    Horányi, Mihály
    Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA.;NASA, SSERVI, Inst Modeling Plasma Atmospheres & Cosm Dus, Moffett Field, CA 94035 USA..
    Electron and Ion Dynamics of the Solar Wind Interaction with a Weakly Outgassing Comet2017Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 118, nr 20, artikkel-id 205101Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Using a 3D fully kinetic approach, we disentangle and explain the ion and electron dynamics of the solar wind interaction with a weakly outgassing comet. We show that, to first order, the dynamical interaction is representative of a four-fluid coupled system. We self-consistently simulate and identify the origin of the warm and suprathermal electron distributions observed by ESA's Rosetta mission to comet 67P/Churyumov-Gerasimenko and conclude that a detailed kinetic treatment of the electron dynamics is critical to fully capture the complex physics of mass-loading plasmas.

  • 320.
    Deca, Jan
    et al.
    Univ Colorado, LASP, Boulder, CO 80303 USA;NASA, Inst Modeling Plasma Atmospheres & Cosm Dust, SSERVI, Moffett Field, CA 94035 USA.
    Henri, Pierre
    CNRS, LPC2E, F-45071 Orleans, France;Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
    Divin, Andrey
    St Petersburg State Univ, Phys Dept, St Petersburg 198504, Russia.
    Eriksson, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Galand, Marina
    Imperial Coll London, Dept Phys, London SW7 2AZ, England.
    Beth, Arnaud
    Imperial Coll London, Dept Phys, London SW7 2AZ, England.
    Ostaszewski, Katharina
    Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys IGeP, D-38106 Braunschweig, Germany.
    Horanyi, Mihaly
    Univ Colorado, LASP, Boulder, CO 80303 USA;NASA, Inst Modeling Plasma Atmospheres & Cosm Dust, SSERVI, Moffett Field, CA 94035 USA;Univ Colorado, Dept Phys, Boulder, CO 80309 USA.
    Building a Weakly Outgassing Comet from a Generalized Ohm's Law2019Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, nr 5, artikkel-id 055101Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    When a weakly outgassing comet is sufficiently close to the Sun, the formation of an ionized coma results in solar wind mass loading and magnetic field draping around its nucleus. Using a 3D fully kinetic approach, we distill the components of a generalized Ohm's law and the effective electron equation of state directly from the self-consistently simulated electron dynamics and identify the driving physics in the various regions of the cometary plasma environment. Using the example of space plasmas, in particular multispecies cometary plasmas, we show how the description for the complex kinetic electron dynamics can be simplified through a simple effective closure, and identify where an isotropic single-electron fluid Ohm's law approximation can be used, and where it fails.

  • 321.
    Delafosse, C.
    et al.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Verney, D.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Marevic, P.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France;CEA, DAM, DIF, F-91297 Arpajon, France.
    Gottardo, A.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Michelagnoli, C.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Lemasson, A.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Goasduff, A.
    Inst Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.
    Ljungvall, J.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, CSNSM, F-91406 Orsay, France.
    Clement, E.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Korichi, A.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, CSNSM, F-91406 Orsay, France.
    De Angelis, G.
    Inst Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.
    Andreoiu, C.
    Simon Fraser Univ, Dept Chem, Burnaby, BC V5A S16, Canada.
    Babo, M.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France;CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Boso, A.
    Univ Padua, Dept Fis & Astron, I-35131 Padua, Italy;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.
    Didierjean, F.
    Univ Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France.
    Dudouet, J.
    Univ Lyon 1, Univ Lyon, CNRS IN2P3, IPN Lyon, F-69622 Villeurbanne, France.
    Franchoo, S.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Gadea, A.
    Univ Valencia, CSIC, IFIC, Apartado Oficial 22085, Valencia 46071, Spain.
    Georgiev, G.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, CSNSM, F-91406 Orsay, France.
    Ibrahim, F.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Jacquot, B.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Konstantinopoulos, T.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, CSNSM, F-91406 Orsay, France.
    Lenzi, S. M.
    Univ Padua, Dept Fis & Astron, I-35131 Padua, Italy;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.
    Maquart, G.
    Univ Lyon 1, Univ Lyon, CNRS IN2P3, IPN Lyon, F-69622 Villeurbanne, France.
    Matea, I
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Mengoni, D.
    Univ Padua, Dept Fis & Astron, I-35131 Padua, Italy;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.
    Napoli, D. R.
    Inst Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.
    Niksic, T.
    Univ Zagreb, Fac Sci, Dept Phys, Bijenicka C 32, Zagreb 10000, Croatia.
    Olivier, L.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Perez-Vidal, R. M.
    Univ Valencia, CSIC, IFIC, Apartado Oficial 22085, Valencia 46071, Spain.
    Portail, C.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Recchia, F.
    Univ Padua, Dept Fis & Astron, I-35131 Padua, Italy;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.
    Redon, N.
    Univ Lyon 1, Univ Lyon, CNRS IN2P3, IPN Lyon, F-69622 Villeurbanne, France.
    Siciliano, M.
    Inst Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.
    Stefan, I
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, Inst Phys Nucl, F-91406 Orsay, France.
    Stezowski, O.
    Univ Lyon 1, Univ Lyon, CNRS IN2P3, IPN Lyon, F-69622 Villeurbanne, France.
    Vretenar, D.
    Univ Zagreb, Fac Sci, Dept Phys, Bijenicka C 32, Zagreb 10000, Croatia.
    Zielinska, M.
    CEA Saclay, IRFU, F-91191 Gif Sur Yvette, France.
    Barrientos, D.
    CERN, CH-1211 Geneva 23, Switzerland.
    Benzoni, G.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy.
    Birkenbach, B.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany.
    Boston, A. J.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.
    Boston, H. C.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.
    Cederwall, B.
    Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden.
    Charles, L.
    Univ Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France.
    Ciemala, M.
    Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Ul Radzikowskiego 152, PL-31342 Krakow, Poland.
    Collado, J.
    Univ Valencia, Dept Ingn Elect, E-46100 Valencia, Spain.
    Cullen, D. M.
    Univ Manchester, Schuster Lab, Nucl Phys Grp, Manchester M13 9PL, Lancs, England.
    Desesquelles, P.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, CSNSM, F-91406 Orsay, France.
    de France, G.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Domingo-Pardo, C.
    Univ Valencia, CSIC, IFIC, Apartado Oficial 22085, Valencia 46071, Spain.
    Eberth, J.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany.
    Gonzalez, V
    Univ Valencia, Dept Ingn Elect, E-46100 Valencia, Spain.
    Harkness-Brennan, L. J.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.
    Hess, H.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany.
    Judson, D. S.
    Univ Liverpool, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England.
    Jungclaus, A.
    CSIC, Inst Estruct Mat, E-28006 Madrid, Spain.
    Korten, W.
    CEA Saclay, IRFU, F-91191 Gif Sur Yvette, France.
    Lefevre, A.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Legruel, F.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Menegazzo, R.
    Univ Padua, Dept Fis & Astron, I-35131 Padua, Italy;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.
    Million, B.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy.
    Nyberg, Johan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärnfysik.
    Quintana, B.
    Univ Salamanca, Lab Radiac Ionizantes, E-37008 Salamanca, Spain.
    Ralet, D.
    Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, CSNSM, F-91406 Orsay, France.
    Reiter, P.
    Univ Cologne, Inst Kernphys, Zulpicher Str 77, D-50937 Cologne, Germany.
    Saillant, F.
    CEA DSM CNRS IN2P3, GANIL, F-14076 Caen, France.
    Sanchis, E.
    Univ Valencia, Dept Ingn Elect, E-46100 Valencia, Spain.
    Theisen, Ch
    CEA Saclay, IRFU, F-91191 Gif Sur Yvette, France.
    Dobon, J. J. Valiente
    Inst Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.
    Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni-78 Region: A Hint from Lifetime Measurements2018Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, nr 19, artikkel-id 192502Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lifetime measurements of excited states of the light N = 52 isotones Kr-88, Se-86, and Ge-84 have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2; 2(+)-> 0(+)) and B(E2; 4(+)-> 2(+)) were obtained for the first time for the hard-to-reach 84Ge. While the B(E2; 2(+)-> 0(+) ) values of Kr-88, Se-86 saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g(7/2), 1h(11/2)) space of an inert Ni-78 core, the value obtained for Ge-84 largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N less than or similar to 49, extend beyond N = 50. The onset of collectivity at Z = 32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector rho field in shell-structure evolution.

  • 322. Ding, Yang
    et al.
    Ahuja, Rajeev
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Shu, Jinfu
    Chow, Paul
    Luo, Wei
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Mao, Ho-kwang
    Structural phase transition of vanadium at 69 GPa2007Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, nr 8, s. 085502-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A phase transition was observed at 63-69 GPa and room temperature in vanadium with synchrotron x-ray diffraction. The transition is characterized as a rhombohedral lattice distortion of the body-centered-cubic vanadium without a discontinuity in the pressure-volume data, thus representing a novel type of transition that has never been observed in elements. Instead of driven by the conventional s-d electronic transition mechanism, the phase transition could be associated with the softening of C-44 trigonal elasticity tensor that originates from the combination of Fermi surface nesting, band Jahn-Teller distortion, and electronic topological transition.

  • 323. Doornenbal, P.
    et al.
    Scheit, H.
    Aoi, N.
    Takeuchi, S.
    Li, K.
    Takeshita, E.
    Wang, H.
    Baba, H.
    Deguchi, S.
    Fukuda, N.
    Geissel, H.
    Gernhäuser, R.
    Gibelin, J.
    Hachiuma, I.
    Hara, Y.
    Hinke, C.
    Inabe, N.
    Itahashi, K.
    Itoh, S.
    Kameda, D.
    Kanno, S.
    Kawada, Y.
    Kobayashi, N.
    Kondo, Y.
    Krücken, R.
    Kubo, T.
    Kuboki, T.
    Kusaka, K.
    Lantz, Mattias
    RIKEN Nishina Center.
    Michimasa, S.
    Motobayashi, T.
    Nakamura, T.
    Nakao, T.
    Namihira, K.
    Nishimura, S.
    Ohnishi, T.
    Ohtake, M.
    Orr, N. A.
    Otsu, H.
    Ozeki, K.
    Satou, Y.
    Shimoura, S.
    Sumikama, T.
    Takechi, M.
    Takeda, H.
    Tanaka, K. N.
    Tanaka, K.
    Togano, Y.
    Winkler, M.
    Yanagisawa, Y.
    Yoneda, K.
    Yoshida, A.
    Yoshida, K.
    Sakurai, H.
    Spectroscopy of 32Ne and the "œIsland of Inversion"2009Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, nr 3, s. 032501-1-032501-4Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report on the first spectroscopic study of the N = 22 nucleus 32Ne at the newly completed RIKEN Radioactive Ion Beam Factory. A single γ-ray line with an energy of 722(9) keV was observed in both inelastic scattering of a 226 MeV=u 32Ne beam on a carbon target and proton removal from 33Na at 245 MeV=u. This transition is assigned to the deexcitation of the first Jπ = 2+ state in 32Ne to the 0+ ground state. Interpreted through comparison with state-of-the-art shell-model calculations, the low excitation energy demonstrates that the ‘‘island of inversion’’ extends to at least N = 22 for the Ne isotopes.

  • 324. Du, Jiangfeng
    et al.
    Zou, Ping
    Shi, Mingjun
    Kwek, Leong Chuan
    Pan, Jian-Wei
    Oh, Choo Hiap
    Ekert, Artur
    Oi, Daniel K.L.
    Ericsson, Marie
    Dept. of Physics, Univ. of Illinois at Urbana-Champaign, USA.
    An experimental observation of geometric phases for mixed states using NMR interferometry2003Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 91, nr 10, s. 100403-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Examples of geometric phases abound in many areas of physics. They offer both fundamental insights into many physical phenomena and lead to interesting practical implementations. One of them, as indicated recently, might be an inherently fault-tolerant quantum computation. This, however, requires to deal with geometric phases in the presence of noise and interactions between different physical subsystems. Despite the wealth of literature on the subject of geometric phases very little is known about this very important case. Here we report the first experimental study of geometric phases for mixed quantum states. We show how different they are from the well understood, noiseless, pure-state case.

  • 325. Dubrovinsky, L.
    et al.
    Dubrovinskaia, N.
    Crichton, W. A.
    Mikhaylushkin, Arkady S.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Simak, S. I.
    Abrikosov, I. A.
    de Almeida, J. Souza
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Ahuja, Rajeev B.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Luo, Wei
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Johansson, B.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Noblest of all metals is structurally unstable at high pressure2007Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, nr 4, s. 045503-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In a series of experiments in externally electrically heated diamond anvil cells we demonstrate that at pressures above similar to 240 GPa gold adopts a hexagonal-close-packed structure. Ab initio calculations predict that at pressures about 250 GPa different stacking sequences of close-packed atomic layers in gold become virtually degenerate in energy, strongly supporting the experimental observations.

  • 326.
    Duda, Laurent C.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Schmitt, Torsten
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Magnuson, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Forsberg, Johan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Olsson, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Nordgren, Joseph
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Okada, K.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Kotani, A.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Reply to comment by Hüfner on "Resonant Inelastic X-Ray Scattering at the Oxygen K Resonance of NiO: Nonlocal Charge Transfer and Double-Singlet Excitations"2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 269702Artikkel i tidsskrift (Annet vitenskapelig)
  • 327.
    Duda, Laurent
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Fysik II.
    Schmitt, Thorsten
    Magnuson, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Fysik II.
    Forsberg, Johan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
    Olsson, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Fysik II.
    Nordgren, Joseph
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Fysik II.
    Okada, K
    Kotani, A
    Resonant inelastic x-ray scattering at the NiO O K-resonance: non-local charge-transfer and double singlet excitations2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, nr 6, s. 067402-Artikkel i tidsskrift (Fagfellevurdert)
  • 328.
    Duda, Laurent
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Schmitt, Thorsten
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen, Fysik II.
    Nordgren, Joseph
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Kuiper, Pieter
    Dhalenne, Guy
    Revscolevschi, Alexandre
    Low-energy excitations in resonant inelastic X-ray scattering of α' - NaV2O52004Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 15, nr 93, s. 169701-Artikkel i tidsskrift (Fagfellevurdert)
  • 329.
    Duda, Laurent-Claudius
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Schmitt, Thorsten
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Magnuson, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Forsberg, J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Olsson, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Nordgren, J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Okada, K.
    Kotani, A.
    Comment on "Resonant inelastic x-ray scattering at the oxygen K resonance of NiO: Nonlocal charge transfer and double-singlet excitations" - Reply2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 26, artikkel-id 269702Artikkel i tidsskrift (Fagfellevurdert)
  • 330.
    Edström, Alexander
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Lubk, Axel
    Tech Univ Dresden, Triebenberg Lab, Dresden, Germany.
    Rusz, Ján
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Elastic Scattering of Electron Vortex Beams in Magnetic Matter.2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, nr 12, artikkel-id 127203Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Elastic scattering of electron vortex beams on magnetic materials leads to a weak magnetic contrast due to Zeeman interaction of orbital angular momentum of the beam with magnetic fields in the sample. The magnetic signal manifests itself as a redistribution of intensity in diffraction patterns due to a change of sign of the orbital angular momentum of the electron vortex beam. While in the atomic resolution regime the magnetic signal is most likely under the detection limits of present transmission electron microscopes, for electron probes with high orbital angular momenta, and correspondingly larger spatial extent, its detection is predicted to be feasible.

  • 331. Ehlers, G.
    et al.
    Mamontov, E.
    Zamponi, M.
    Kam, K. C.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för materialkemi.
    Gardner, J. S.
    Direct Observation of a Nuclear Spin Excitation in Ho2Ti2O72009Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, nr 1, s. 016405-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A single nondispersive excitation is observed by means of neutron backscattering, at E-0=26.3 mu eV in the spin ice Ho2Ti2O7 but not in the isotopically enriched (Dy2Ti2O7)-Dy-162 analogue. The intensity of this excitation is rather small, less than or similar to 0.2% of the elastic intensity. It is clearly observed below 80 K but resolution limited only below similar to 65 K. The application of a magnetic field up to mu H-0=4.5 T, at 1.6 K, has no measurable effect on the energy or intensity. This nuclear excitation is believed to perturb the electronic, Ising spin system resulting in the persistent spin dynamics observed in spin ice compounds.

  • 332.
    Ekeberg, Tomas
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Svenda, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Abergel, Chantal
    Maia, Filipe R. N. C.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Seltzer, Virginie
    Claverie, Jean-Michel
    Hantke, Max
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Jönsson, Olof
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Nettelblad, Carl
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    van der Schot, Gijs
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Liang, Mengning
    DePonte, Daniel P.
    Barty, Anton
    Seibert, M. Marvin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Iwan, Bianca
    Andersson, Inger
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Loh, N. Duane
    Martin, Andrew V.
    Chapman, Henry
    Bostedt, Christoph
    Bozek, John D.
    Ferguson, Ken R.
    Krzywinski, Jacek
    Epp, Sascha W.
    Rolles, Daniel
    Rudenko, Artem
    Hartmann, Robert
    Kimmel, Nils
    Hajdu, Janos
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Molekylär biofysik.
    Three-dimensional reconstruction of the giant mimivirus particle with an X-ray free-electron laser2015Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, nr 9, s. 098102:1-6, artikkel-id 098102Artikkel i tidsskrift (Fagfellevurdert)
  • 333. Eklund, Per
    et al.
    Dahlqvist, Martin
    Tengstrand, Olof
    Hultman, Lars
    Lu, Jun
    Nedfors, Nils
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Jansson, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Rosen, Johanna
    Discovery of the Ternary Nanolaminated Compound Nb2GeC by a Systematic Theoretical-Experimental Approach2012Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, nr 3, s. 035502-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Since the advent of theoretical materials science some 60 years ago, there has been a drive to predict and design new materials in silicio. Mathematical optimization procedures to determine phase stability can be generally applicable to complex ternary or higher-order materials systems where the phase diagrams of the binary constituents are sufficiently known. Here, we employ a simplex-optimization procedure to predict new compounds in the ternary Nb-Ge-C system. Our theoretical results show that the hypothetical Nb2GeC is stable, and excludes all reasonably conceivable competing hypothetical phases. We verify the existence of the Nb2GeC phase by thin film synthesis using magnetron sputtering. This hexagonal nanolaminated phase has a and c lattice parameters of similar to 3.24 angstrom and 12.82 angstrom.

  • 334.
    Eland, John H.D.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
    Tashiro, M.
    Linusson, P.
    Ehara, M.
    Ueda, K.
    Feifel, Raimund
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Mjukröntgenfysik.
    Double Core Hole Creation and Subsequent Auger Decay in NH3 and CH4 Molecules2010Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, nr 21, s. 213005-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Energies of the hollow molecules CH42+ and NH32+ with double vacancies in the 1s shells have been measured using an efficient coincidence technique combined with synchrotron radiation. The energies of these states have been determined accurately by high level electronic structure calculations and can be well understood on the basis of a simple theoretical model. Their major decay pathway, successive Auger emissions, leads first to a new form of triply charged ion with a core hole and two valence vacancies; experimental evidence for such a state is presented with its theoretical interpretation. Preedge 2-hole-1-particle (2h-1p) states at energies below the double core-hole states are located in the same experiments and their decay pathways are also identified.

  • 335.
    Elf, Johan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Nilsson, Karin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Tenson, Tanel
    Ehrenberg, Måns
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi.
    Bistable bacterial growth rate in response to antibiotics with low membrane permeability2006Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, nr 25, s. 258104-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We demonstrate that growth rate bistability for bacterial cells growing exponentially at a fixed external antibiotic concentration can emerge when the cell wall permeability for the drug is low and the growth rate sensitivity to the intracellular drug concentration is high. Under such conditions, an initially high growth rate can remain high, due to dilution of the intracellular drug concentration by rapid cell volume increase, while an initially low growth rate can remain low, due to slow cell volume increase and insignificant drug dilution. Our findings have implications for the testing of novel antibiotics on growing bacterial strains.

  • 336. Emile, Olivier
    et al.
    Brousseau, Christian
    Emile, Janine
    Niemiec, Ronan
    Madhjoubi, Kouroch
    Thidé, Bo
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Electromagnetically Induced Torque on a Large Ring in the Microwave Range2014Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, nr 5, s. 053902-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report on the exchange of orbital angular momentum between an electromagnetic wave and a 30 cm diameter ring. Using a turnstile antenna in the GHz range, we induce a torque on a suspended copper strip of the order of 10(-8) N m. Rotations of a few degrees and accelerations up to 4 x 10(-4) degrees/s(2) are observed. A linear dependence of the acceleration as a function of the applied power is found. There are many applications in the detection of angular momentum in electromagnetics, in acoustics, and also in the magnetization of nanostructures.

  • 337.
    Enberg, Rikard
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för kärn- och partikelfysik.
    Ingelman, Gunnar
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för kärn- och partikelfysik, Högenergifysik.
    Kissavos, A.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för kärn- och partikelfysik, Högenergifysik.
    Timneanu, Nicusor
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för kärn- och partikelfysik, Högenergifysik.
    Diffractive Higgs Boson Production at the Fermilab Tevatron and the CERN Large Hadron Collider2002Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 89, nr 8, s. 081801-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Improved possibilities to find the Higgs boson in diffractive events, having less hadronic activity, depend on whether the cross section is large enough. Based on the soft color interaction models that successfully describe diffractive hard scattering at DESY HERA and the Fermilab Tevatron, we find that only a few diffractive Higgs events may be produced at the Tevatron, but we predict a substantial rate at the CERN Large Hadron Collider.

  • 338. Ergun, R. E.
    et al.
    Andersson, L.
    Tao, J.
    Angelopoulos, V.
    Bonnell, J.
    McFadden, J. P.
    Larson, D. E.
    Eriksson, S.
    Johansson, T.
    Cully, Christopher
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Newman, D. N.
    Goldman, M. V.
    Roux, A.
    LeContel, O.
    Glassmeier, K. -H
    Baumjohann, W.
    Observations of Double Layers in Earth's Plasma Sheet2009Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, nr 15, s. 155002-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report the first direct observations of parallel electric fields (E-parallel to) carried by double layers (DLs) in the plasma sheet of Earth's magnetosphere. The DL observations, made by the THEMIS spacecraft, have E-parallel to signals that are analogous to those reported in the auroral region. DLs are observed during bursty bulk flow events, in the current sheet, and in plasma sheet boundary layer, all during periods of strong magnetic fluctuations. These observations imply that DLs are a universal process and that strongly nonlinear and kinetic behavior is intrinsic to Earth's plasma sheet.

  • 339.
    Ergun, R. E.
    et al.
    Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA..
    Goodrich, K. A.
    Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA..
    Wilder, F. D.
    Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA..
    Holmes, J. C.
    Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA..
    Stawarz, J. E.
    Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA..
    Eriksson, S.
    Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA..
    Sturner, A. P.
    Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA.;Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA..
    Malaspina, D. M.
    Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA..
    Usanova, M. E.
    Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80303 USA..
    Torbert, R. B.
    Univ New Hampshire, Durham, NH 03824 USA.;Southwest Res Inst, San Antonio, TX 78238 USA..
    Lindqvist, P. -A
    Khotyaintsev, Yuri
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutet för rymdfysik, Uppsalaavdelningen.
    Burch, J. L.
    Southwest Res Inst, San Antonio, TX 78238 USA..
    Strangeway, R. J.
    Univ Calif Los Angeles, Los Angeles, CA 90095 USA..
    Russell, C. T.
    Univ Calif Los Angeles, Los Angeles, CA 90095 USA..
    Pollock, C. J.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA..
    Giles, B. L.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA..
    Hesse, M.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA..
    Chen, L. J.
    Univ Maryland, College Pk, MD 20742 USA..
    Lapenta, G.
    Leuven Univ, Leuven, Belgium..
    Goldman, M. V.
    Univ Colorado, Dept Phys, Boulder, CO 80303 USA..
    Newman, D. L.
    Univ Colorado, Dept Phys, Boulder, CO 80303 USA..
    Schwartz, S. J.
    Univ Colorado, Lab Atmospher & Space Sci, Boulder, CO 80303 USA.;Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London, England..
    Eastwood, J. P.
    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London, England..
    Phan, T. D.
    Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA..
    Mozer, F. S.
    Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA..
    Drake, J.
    Univ Maryland, College Pk, MD 20742 USA..
    Shay, M. A.
    Univ Delaware, Newark, DE 19716 USA..
    Cassak, P. A.
    W Virginia Univ, Morgantown, WV 26506 USA..
    Nakamura, R.
    Austrian Acad Sci, Space Res Inst, A-8010 Graz, Austria..
    Marklund, G.
    KTH Royal Inst Technol, Stockholm, Sweden..
    Magnetospheric Multiscale Satellites Observations of Parallel Electric Fields Associated with Magnetic Reconnection2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, nr 23, artikkel-id 235102Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We report observations from the Magnetospheric Multiscale satellites of parallel electric fields (E-vertical bar vertical bar) associated with magnetic reconnection in the subsolar region of the Earth's magnetopause. E-vertical bar vertical bar events near the electron diffusion region have amplitudes on the order of 100 mV/m, which are significantly larger than those predicted for an antiparallel reconnection electric field. This Letter addresses specific types of E-vertical bar vertical bar events, which appear as large-amplitude, near unipolar spikes that are associated with tangled, reconnected magnetic fields. These E-vertical bar vertical bar events are primarily in or near a current layer near the separatrix and are interpreted to be double layers that may be responsible for secondary reconnection in tangled magnetic fields or flux ropes. These results are telling of the three-dimensional nature of magnetopause reconnection and indicate that magnetopause reconnection may be often patchy and/or drive turbulence along the separatrix that results in flux ropes and/or tangled magnetic fields.

  • 340.
    Ericsson, Marie
    et al.
    Dept. of Physics, Univ. of Illinois at Urbana-Champaign, USA.
    Achilles, Daryl
    Barreiro, Julio T.
    Branning, David
    Peters, Nicholas A.
    Kwiat, Paul G.
    Measurement of geometric phase for mixed states using single photon interferometry2005Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 94, nr 5, s. 050401-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Geometric phase may enable inherently fault-tolerant quantum computation. However, due to potential decoherence effects, it is important to understand how such phases arise for {\it mixed} input states. We report the first experiment to measure mixed-state geometric phases in optics, using a Mach-Zehnder interferometer, and polarization mixed states that are produced in two different ways: decohering pure states with birefringent elements; and producing a nonmaximally entangled state of two photons and tracing over one of them, a form of remote state preparation.

  • 341.
    Ericsson, Marie
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi.
    Pati, Arun K.
    Institute of Physics, Bhubaneswar, India.
    Sjöqvist, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi.
    Brännlund, Johan
    SCFAB, Dept. of Physics, Stockholm Univ., Sweden.
    Oi, Daniel K.L.
    Centre for Quantum Computation, Clarendon Laboratory, University of Oxford, UK.
    Mixed state geometric phases, entangled systems, and local unitary transformations2003Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 91, nr 9, s. 090405-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The geometric phase for a pure quantal state undergoing an arbitrary evolution is a "memory'' of the geometry of the path in the projective Hilbert space of the system. We find that Uhlmann's geometric phase for a mixed quantal state undergoing unitary evolution not only depends on the geometry of the path of the system alone but also on a constrained bi-local unitary evolution of the purified entangled state. We analyze this in general, illustrate it for the qubit case, and propose an experiment to test this effect. We also show that the mixed state geometric phase proposed recently in the context of interferometry requires uni-local transformations and is therefore essentially a property of the system alone.

  • 342.
    Feifel, Raimund
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik. Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden..
    Eland, John H. D.
    Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden.;Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, S Parks Rd, Oxford OX1 3QZ, England..
    Squibb, Richard J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik. Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden..
    Mucke, Melanie
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Zagorodskikh, Sergey
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik. Univ Gothenburg, Dept Phys, Origovagen 6B, S-41296 Gothenburg, Sweden..
    Linusson, Per
    Stockholm Univ, Dept Phys, AlbaNova Univ Ctr, S-10691 Stockholm, Sweden..
    Tarantelli, Francesco
    Dipartimento Chim Biol & Biotecnol, Via Elce di Sotto 8, I-06123 Perugia, Italy..
    Kolorenc, Premysl
    Charles Univ Prague, Fac Math & Phys, Inst Theoret Phys, V Holesovickach 2, Prague 18000, Czech Republic..
    Averbukh, Vitali
    Univ London Imperial Coll Sci Technol & Med, Dept Phys, Prince Consort Rd, London SW7 2AZ, England..
    Ultrafast Molecular Three-Electron Auger Decay2016Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, nr 7, artikkel-id 073001Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Three-electron Auger decay is an exotic and elusive process, in which two outer-shell electrons simultaneously refill an inner-shell double vacancy with emission of a single Auger electron. Such transitions are forbidden by the many-electron selection rules, normally making their decay lifetimes orders of magnitude longer than the few-femtosecond lifetimes of normal (two-electron) Auger decay. Here we present theoretical predictions and direct experimental evidence for a few-femtosecond three-electron Auger decay of a double inner-valence-hole state in CH3F. Our analysis shows that in contrast to double core holes, double inner-valence vacancies in molecules can decay exclusively by this ultrafast threeelectron Auger process, and we predict that this phenomenon occurs widely.

  • 343.
    Festin, Örjan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för materialvetenskap.
    Svedlindh, Peter
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för materialvetenskap.
    Kim, Beom Jun
    Minnhagen, Petter
    Chakalov, Radoslav
    Ivanov, Zdravko
    Vortex Fluctuations in High-Tc Films: Flux Noise Spectrum and Complex Impedance1999Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 83, nr 26, s. 5567-5570Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The flux noise spectrum and complex impedance for a 500 Å thick YBCO film are measured and comparedwith predictions for two-dimensional vortex fluctuations. It is verified that the complex impedanceand the flux noise spectra are proportional to each other, that the logarithm of the flux noise spectrafor different temperatures has a common tangent with slope 21, and that the amplitude of the noisedecreases as d23, where d is the height above the film at which the magnetic flux is measured. Acrossover from normal to anomalous vortex diffusion is indicated by the measurements and is discussedin terms of a two-dimensional decoupling.

  • 344.
    Filipp, Stefan
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi.
    Sjöqvist, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kvantkemi.
    Off-diagonal geometric phases for mixed states2003Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 90, nr 5, s. 050403-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We extend the off-diagonal geometric phase [Phys. Rev. Lett. 85, 3067 (2000)] to mixed quantal states. The nodal structure of this phase in the qubit (two-level) case is compared with that of the diagonal mixed state geometric phase [Phys. Rev. Lett. 85, 2845 (2000)]. Extension to higher dimensional Hilbert spaces is delineated. A physical scenario for the off-diagonal mixed state geometric phase in polarization-entangled two-photon interferometry is proposed.

  • 345. Forrey, Robert
    et al.
    Cote, Robin
    Dalgarno, Alex
    Jonsell, Svante
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Saenz, Alejandro
    Froelich, Piotr
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Collisions between metastable hydrogen atoms at thermal energies2000Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 85, nr 20, s. 4245-4248Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The complex interaction potentials arising in the approach of two metastable hydrogen 2s atoms are calculated and the cross sections for ionization, excitation transfer, and elastic scattering are predicted. The measured cross section for associative ionization at E = 4.1 meV equals 2×10-15 cm2. We calculate a total ionization cross section of 2×10-13 cm2, varying as E-2/3 at higher energies. Thus it appears that dissociative ionization is the major ionization channel. We find also that double excitation transfer into two excited H(2p) atoms is still more probable with the large cross section of 9×10-12 cm2 at E = 4.1 meV varying as E-1/2 at higher energies. The detection of the resulting Lyman alpha photons would provide a diagnostic test of our predictions.

  • 346.
    Fransson, J.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och materialvetenskap.
    Zhu, Jian-Xin
    Balatsky, A. V.
    Vibrating superconducting island in a Josephson junction2008Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 101, nr 6, s. 067202-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We consider a combined nanomechanical-supercondcuting device that allows the Cooper pair tunneling to interfere with the mechanical motion of the middle superconducting island. Coupling of mechanical oscillations of a superconducting island between two superconducting leads to the electronic tunneling generates a supercurrent that is modulated by the oscillatory motion of the island. This coupling produces alternating finite and vanishing supercurrent as function of the superconducting phases. Current peaks are sensitive to the superconducting phase shifts relative to each other. The proposed device may be used to study the nanoelectromechanical coupling in case of superconducting electronics.

  • 347.
    Fransson, Jonas
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Eriksson, Olle
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Fysiska institutionen.
    Sandalov, Igor
    Many-body approach to spin-dependent transport in quantum dot systems2002Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 88, nr 22, s. 226601-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    By means of a diagram technique for Hubbard operators, we show the existence of a spin-dependent renormalization of the localized levels in an interacting region, e.g., quantum dot, modeled by the Anderson Hamiltonian with two conduction bands. It is shown that the renormalization of the levels with a given spin direction is due to kinematic interactions with the conduction subbands of the opposite spin. The consequence of this dressing of the localized levels is a drastically decreased tunneling current for ferromagnetically ordered leads compared to that of paramagnetically ordered leads. Furthermore, the studied system shows a spin-dependent resonant tunneling behavior for ferromagnetically ordered leads.

  • 348.
    Fransson, Jonas
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Ren, Jie
    Zhu, Jian-Xin
    Electrical and Thermal Control of Magnetic Exchange Interactions2014Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, nr 25, s. 257201-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We investigate the far-from-equilibrium nature of magnetic anisotropy and exchange interactions between molecular magnets embedded in a tunnel junction. By mapping to an effective spin model, these magnetic interactions can be divided into three types: isotropic Heisenberg, anisotropic Ising, and anisotropic Dzyaloshinski-Moriya contributions, which are attributed to the background nonequilibrium electronic structures. We further demonstrate that both the magnetic self- and exchange interactions can be controlled either electrically by gating and tuning the voltage bias, or thermally by adjusting the temperature bias. We show that the Heisenberg and Ising interactions scale linearly, while the Dzyaloshinski-Moriya interaction scales quadratically, with the molecule-lead coupling strength. The interactions scale linearly with the effective spin polarizations of the leads and the molecular coherence. Our results pave a way for smart control of magnetic exchange interactions at atomic and molecular levels.

  • 349. Frasinski, L. J.
    et al.
    Zhaunerchyk, Vitali
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Mucke, Melanie
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Squibb, Richard J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Siano, M.
    Eland, John H. D.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Linusson, P.
    v. d. Meulen, P.
    Salen, P.
    Thomas, R. D.
    Larsson, M.
    Foucar, L.
    Ullrich, J.
    Motomura, K.
    Mondal, S.
    Ueda, K.
    Osipov, T.
    Fang, L.
    Murphy, B. F.
    Berrah, N.
    Bostedt, C.
    Bozek, J. D.
    Schorb, S.
    Messerschmidt, M.
    Glownia, J. M.
    Cryan, J. P.
    Coffee, R. N.
    Takahashi, O.
    Wada, S.
    Piancastelli, Maria Novella
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Richter, R.
    Prince, K. C.
    Feifel, Raimund
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
    Dynamics of Hollow Atom Formation in Intense X-Ray Pulses Probed by Partial Covariance Mapping2013Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, nr 7, artikkel-id 073002Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    When exposed to ultraintense x-radiation sources such as free electron lasers (FELs) the innermost electronic shell can efficiently be emptied, creating a transient hollow atom or molecule. Understanding the femtosecond dynamics of such systems is fundamental to achieving atomic resolution in flash diffraction imaging of noncrystallized complex biological samples. We demonstrate the capacity of a correlation method called "partial covariance mapping'' to probe the electron dynamics of neon atoms exposed to intense 8 fs pulses of 1062 eV photons. A complete picture of ionization processes competing in hollow atom formation and decay is visualized with unprecedented ease and the map reveals hitherto unobserved nonlinear sequences of photoionization and Auger events. The technique is particularly well suited to the high counting rate inherent in FEL experiments.

  • 350.
    Froelich, Piotr
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Jonsell, Svante
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Kvantkemi.
    Saenz, Alejandro
    Zygelman, Bernard
    Dalgarno, Alex
    Hydrogen-antihydrogen collisions2000Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 84, nr 20, s. 4577-4580Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Matter-antimatter interactions are investigated using hydrogen-antihydrogen collisions as an example. Cross sections for elastic scattering and for the antihydrogen loss (either through the rearrangement reaction, resulting in formation of protonium and positronium according to H+H →pp+1 e+e-, or via annihilation in flight) are calculated for the first time in a fully quantum mechanical approach. Implications for experiments intending to trap and cool antihydrogen are discussed.

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