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Journal Articles Physical Review A : Atomic, molecular, and optical physics Year : 2015

Propagation of collective pair excitations in disordered Bose superfluids

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Abstract

We study the effect of disorder on the propagation of collective excitations in a disordered Bose superfluid. We incorporate local density depletion induced by strong disorder at the meanfield level, and formulate the transport of the excitations in terms of a screened scattering problem. We show that the competition of disorder, screening, and density depletion induces a strongly non-monotonic energy dependence of the disorder parameter. In three dimensions, it results in a rich localization diagram with four different classes of mobility spectra, characterized by either no or up to three mobility edges. Implications on experiments with disordered ultracold atoms are discussed.
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hal-01143356 , version 1 (22-04-2015)

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Samuel Lellouch, Lih-King Lim, Laurent Sanchez-Palencia. Propagation of collective pair excitations in disordered Bose superfluids. Physical Review A : Atomic, molecular, and optical physics, 2015, 92, pp.043611. ⟨hal-01143356⟩
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