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      Ground-state properties and collective excitations in a 2D Bose-Einstein condensate with gravity-like interatomic attraction

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      Author
      Keleş, Ahmet
      Sevinçli, Sevilay
      Tanatar, Bilal
      Date
      2008
      Source Title
      Journal of Low Temperature Physics
      Print ISSN
      0022-2291
      Publisher
      Springer
      Volume
      150
      Issue
      3-4
      Pages
      630 - 635
      Language
      English
      Type
      Conference Paper
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      Abstract
      We study the ground-state properties of a Bose-Einstein condensate (BEC) with the short-range repulsion and gravitylike 1/r interatomic attraction in two-dimensions (2D). Using the variational approach, we obtain the ground-state energy and show that the condensate is stable for all interaction strenghts 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 (TF-G) and gravity (G) regimes.
      Keywords
      Cold atom Bose and Fermi systems
      Excitations in quantum systems
      Interaction strenght
      Interatomic attraction
      Atomic physics
      Excitation energy
      Gravitation
      Ground state
      Bose-Einstein condensation
      Permalink
      http://hdl.handle.net/11693/26901
      Published Version (Please cite this version)
      http://dx.doi.org/10.1007/s10909-007-9599-z
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