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      Collective excitations of strongly coupled bilayer charged Bose liquids in the third-frequency-moment sum rule

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      Author(s)
      Tas, M.
      Tanatar, Bilal
      Date
      2008
      Source Title
      Physical Review B - Condensed Matter and Materials Physics
      Print ISSN
      1098-0121
      Publisher
      The American Physical Society
      Volume
      78
      Issue
      11
      Pages
      115324-1 - 115324-6
      Language
      English
      Type
      Article
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      Abstract
      We calculate the collective excitation modes of strongly coupled bilayer charged Bose systems. We employ the dielectric matrix formulation to study the correlation effects within the random-phase approximation (RPA), the self consistent field approximation Singwi, Tosi, Land, and Sjölander (STLS), and the quasilocalized charge approximation (QLCA), which satisfies the third-frequency-moment (〈ω3〉) sum rule. We find that the QLCA predicts a long-wavelength correlation-induced energy gap in the out-of-phase plasmon mode, similar to the situation in electronic bilayer systems. The energy gap and the plasmon density of states are studied as a function of interlayer separation and coupling parameter rs. The results should be helpful for experimental investigations.
      Permalink
      http://hdl.handle.net/11693/23002
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevB.78.115324
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