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.
https://hal-iogs.archives-ouvertes.fr/hal-01143356
Contributeur : Lih-King Lim
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Soumis le : mercredi 22 avril 2015 - 09:56:32
Dernière modification le : jeudi 11 janvier 2018 - 06:26:41
Document(s) archivé(s) le : mardi 18 avril 2017 - 22:49:44
Samuel Lellouch, Lih-King Lim, Laurent Sanchez-Palencia. Propagation of collective pair excitations in disordered Bose superfluids. Physical Review A, American Physical Society, 2015, 92, pp.043611. 〈hal-01143356〉
