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      Counterflow in Bose gas bilayers: collective modes and dissipationless drag

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      Author(s)
      Abedinpour, S. H.
      Tanatar, Bilal
      Date
      2020
      Source Title
      Low Temperature Physics
      Print ISSN
      1063-777X
      Publisher
      American Institute of Physics
      Volume
      46
      Issue
      5
      Pages
      480 - 484
      Language
      English
      Type
      Article
      Item 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.
      Keywords
      Acoustic waves
      Bosons
      Supercurrent
      Superfluids
      Random phase approximation
      Acoustical properties
      Electrostatics
      Bose gas
      Plasmons
      Fluid drag
      Permalink
      http://hdl.handle.net/11693/75691
      Published Version (Please cite this version)
      https://dx.doi.org/10.1063/10.0001051
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