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      Counterflow in Bose gas bilayers: Collective modes and dissipationless drag

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      Author
      Abedinpour, S. H.
      Tanatar, Bilal
      Date
      2020-03
      Source 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
      Article
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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
      Bose gas bilayers
      Collective modes
      Dissipationless drag
      Permalink
      http://hdl.handle.net/11693/75530
      Published Version (Please cite this version)
      https://doi.org/10.1063/10.0001051
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      • Department of Physics 2336
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