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Transport of strong-coupling polarons in optical lattices


Reference:

Bruderer, M., Klein, A., Clark, S. R. and Jaksch, D., 2008. Transport of strong-coupling polarons in optical lattices. New Journal of Physics, 10, 033015.

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    Official URL:

    http://iopscience.iop.org/article/10.1088/1367-2630/10/3/033015/meta

    Abstract

    We study the transport of ultracold impurity atoms immersed in a Bose-Einstein condensate (BEC) and trapped in a tight optical lattice. Within the strong-coupling regime, we derive an extended Hubbard model describing the dynamics of the impurities in terms of polarons, i.e. impurities dressed by a coherent state of Bogoliubov phonons. Using a generalized master equation based on this microscopic model we show that inelastic and dissipative phonon scattering results in (i) a crossover from coherent to incoherent transport of impurities with increasing BEC temperature and (ii) the emergence of a net atomic current across a tilted optical lattice. The dependence of the atomic current on the lattice tilt changes from ohmic conductance to negative differential conductance within an experimentally accessible parameter regime. This transition is accurately described by an Esaki-Tsu-type relation with the effective relaxation time of the impurities as a temperature-dependent parameter.

    Details

    Item Type Articles
    CreatorsBruderer, M., Klein, A., Clark, S. R. and Jaksch, D.
    DOI10.1088/1367-2630/10/3/033015
    Uncontrolled Keywordsquant-ph
    DepartmentsFaculty of Science > Physics
    Publisher Statement0710.4493v2: This is a submitted version of an article published by IOP Publishing in Bruderer, M, Klein, A, Clark, SR & Jaksch, D 2008, 'Transport of strong-coupling polarons in optical lattices' New Journal of Physics, vol 10, 033015, pp. 1 - 24., 10.1088/1367-2630/10/3/033015
    RefereedYes
    StatusPublished
    ID Code47350

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