Counterflow in Bose gas bilayers: Collective modes and dissipationless drag
Author
Abedinpour, S. H.
Tanatar, Bilal
Date
2020-03Source Title
Low Temperature Physics
Print ISSN
0132-6414
Publisher
Institute for Low Temperature Physics and Engineering
Volume
46
Issue
5
Pages
572 - 577
Language
English
Type
ArticleItem Usage Stats
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Abstract
We investigate the collective density oscillations and dissipationless drag effect in bilayer structures of ultra-cold bosons in the presence of counterflow. We consider different types of inter-particle interactions and obtain the drag coefficient and effect of counterflow on the sound velocity. We observe that counterflow enhances (suppresses) the energy of symmetric (asymmetric) density mode and drives the homogeneous system towards instability. The dependence of the drag coefficient on the spacing between two layers is determined by the form of particle-particle interaction.