Counterflow in Bose gas bilayers: Collective modes and dissipationless drag Article Swipe
Related Concepts
Drag
Drag coefficient
Physics
Instability
Condensed matter physics
Particle (ecology)
Boson
Homogeneous
Mechanics
Classical mechanics
Quantum mechanics
Thermodynamics
Oceanography
Geology
Saeed H. Abedinpour
,
B. Tanatar
·
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1063/10.0001051
· OA: W3032044072
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1063/10.0001051
· OA: W3032044072
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.
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