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Dynamics of an impurity in a one-dimensional lattice
Olli V Lounasmaa Laboratory, Aalto University, FI-00076 Aalto, Finland;.
DPMC-MaNEP, University of Geneva, 24 Quai Ernest Ansermet, 1211 Geneva, Switzerland.
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15213, USA.
DPMC-MaNEP, University of Geneva, 24 Quai Ernest Ansermet, 1211 Geneva, Switzerland.
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2013 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 15, no 4Article in journal (Refereed) Published
Abstract [en]

We study the non-equilibrium dynamics of an impurity in a harmonic trap that is kicked with a well-defined quasi-momentum, and interacts with a bath of free fermions or interacting bosons in a one-dimensional lattice configuration. Using numerical and analytical techniques we investigate the full dynamics beyond linear response, which allows us to quantitatively characterize states of the impurity in the bath for different parameter regimes. These vary from a tightly bound molecular state in a strongly interacting limit to a polaron (dressed impurity) and a free particle for weak interactions, with composite behaviour in the intermediate regime. These dynamics and different parameter regimes should be readily realizable in systems of cold atoms in optical lattices.

Place, publisher, year, edition, pages
IOP Publishing , 2013. Vol. 15, no 4
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-336274DOI: 10.1088/1367-2630/15/4/045018OAI: oai:DiVA.org:uu-336274DiVA: diva2:1165571
Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2017-12-13

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Publisher's full textElectronic full texthttp://iopscience.iop.org/1367-2630/15/4/045018/article/

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