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Signatures of relativistic spin-light coupling in magneto-optical pump-probe experiments
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2017 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 29, no 19, 194002Article in journal (Refereed) Published
Abstract [en]

Femtosecond magneto-optical pump-probe measurements of ultrafast demagnetization show an intriguing difference in the first 100 fs of the magneto-optical Kerr response depending on whether the polarization of the pump and probe beams are in parallel or perpendicular configuration (Bigot et al 2009 Nat. Phys. 5 515). Starting from a most general relativistic Hamiltonian we focus on the ultra-relativistic light-spin interaction and show that this coupling term leads to different light-induced opto-magnetic fields when pump and probe polarization are parallel and perpendicular to each other, providing thus an explanation for the measurements. We also analyze other pump-probe configurations where the pump laser is circularly polarized and the employed probe contains only linearly polarized light and show that similar opto-magnetic effects can be anticipated.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 29, no 19, 194002
Keyword [en]
ultrafast magnetism, pump-probe experiments, relativistic AME coupling, opto-magnetic field
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-321781DOI: 10.1088/1361-648X/aa68eaISI: 000399254200002PubMedID: 28337969OAI: oai:DiVA.org:uu-321781DiVA: diva2:1094836
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2015.0060Swedish National Infrastructure for Computing (SNIC)
Available from: 2017-05-11 Created: 2017-05-11 Last updated: 2017-05-11Bibliographically approved

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Mondal, RitwikBerritta, MarcoOppeneer, Peter M.
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