Counterflow in Bose gas bilayers: collective modes and dissipationless drag

Date
2020
Editor(s)
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Low Temperature Physics
Print ISSN
1063-777X
Electronic ISSN
Publisher
American Institute of Physics
Volume
46
Issue
5
Pages
480 - 484
Language
English
Journal Title
Journal ISSN
Volume Title
Series
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.

Course
Other identifiers
Book Title
Citation
Published Version (Please cite this version)