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      Ground-state properties, vortices, and collective excitations in a two-dimensional Bose-Einstein condensate with gravitylike interatomic attraction

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      Author(s)
      Keleş, A.
      Sevinçli, S.
      Tanatar, Bilal
      Date
      2008
      Source Title
      Physical Review A - Atomic, Molecular, and Optical Physics
      Print ISSN
      1050-2947
      Publisher
      The American Physical Society
      Volume
      77
      Issue
      5
      Language
      English
      Type
      Article
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      Abstract
      We study the ground-state properties of a Bose-Einstein condensate with short-range repulsion and gravitylike 1/r interatomic attraction in two-dimensions (2D). Using the variational approach we obtain the ground-state energy and analyze the stability of the condensate for a range of interaction strengths in 2D. We also determine the collective excitations at zero temperature using the time-dependent variational method. We analyze the properties of the Thomas-Fermi-gravity and gravity regimes, and we examine the vortex states, finding the coherence length and monopole mode frequency for these regimes. Our results are compared and contrasted with those in 3D condensates.
      Keywords
      Atomic physics
      Gravity waves
      Ground state
      Molecular interactions
      Phase stability
      Vortex flow
      Collective excitations
      Fermi gravity
      Gravitylike interatomic attraction
      Interaction strengths
      Bose-Einstein condensation
      Permalink
      http://hdl.handle.net/11693/23123
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevA.77.053604
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