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Phonon resonances in atomic currents through Bose-Fermi mixtures in optical lattices


Reference:

Bruderer, M., Johnson, T. H., Clark, S. R., Jaksch, D., Posazhennikova, A. and Belzig, W., 2010. Phonon resonances in atomic currents through Bose-Fermi mixtures in optical lattices. Physical Review A: Atomic, Molecular, and Optical Physics, 82, 043617.

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    Abstract

    We present an analysis of Bose-Fermi mixtures in optical lattices for the case where the lattice potential of the fermions is tilted and the bosons (in the superfluid phase) are described by Bogoliubov phonons. It is shown that the Bogoliubov phonons enable hopping transitions between fermionic Wannier-Stark states; these transitions are accompanied by energy dissipation into the superfluid and result in a net atomic current along the lattice. We derive a general expression for the drift velocity of the fermions and find that the dependence of the atomic current on the lattice tilt exhibits negative differential conductance and phonon resonances. Numerical simulations of the full dynamics of the system based on the time-evolving block decimation algorithm reveal that the phonon resonances should be observable under the conditions of a realistic measuring procedure.

    Details

    Item Type Articles
    CreatorsBruderer, M., Johnson, T. H., Clark, S. R., Jaksch, D., Posazhennikova, A. and Belzig, W.
    DOI10.1103/PhysRevA.82.043617
    Uncontrolled Keywordscond-mat.quant-gas,quant-ph
    DepartmentsFaculty of Science > Physics
    Publisher Statement1007.3828v2: This is the submitted version of an article published by the American Physical Society in Bruderer, M, Johnson, TH, Clark, SR, Jaksch, D, Posazhennikova, A & Belzig, W 2010, 'Phonon resonances in atomic currents through Bose-Fermi mixtures in optical lattices' Physical Review A: Atomic, Molecular, and Optical Physics, vol 82, 043617, pp. 1 - 7., 10.1103/PhysRevA.82.043617
    RefereedYes
    StatusPublished
    ID Code47323

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