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Paper   IPM / Nano-Sciences / 16351
School of Nano Science
  Title:   Counterflow in Bose gas bilayers: Collective modes and dissipationless drag
  Author(s): 
1.  Saeed Abedinpour
2.  B. Tanatar
  Status:   Published
  Journal: Low Temp. Phys.
  No.:  480
  Vol.:  46
  Year:  2020
  Publisher(s):   Published under license by AIP Publishing
  Supported by:  IPM
  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.

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