Journal of Low Temperature Physics

, Volume 89, Issue 1–2, pp 101–113 | Cite as

Dirty bosons: Screening, inert layers and the Lifshitz tail

  • D. K. K. Lee
  • J. M. F. Gunn
Papers Based On Oral Presentations


The stability of the condensate in the presence of a weakly random substrate is shown to be due to screening of the random potential by distortions of the condensate. However the depletion of the condensate and the speed of sound are both affected: increased and decreased respectively. In the case of strong potential fluctuations He atoms may be trapped (remnants of single-particle localisation in the form of Lifshitz tail states). The circumstances under which this gives a picture of the ‘inert layer’ will be discussed, and a surprising relation to dissipative tunneling will be mentioned.


Magnetic Material Random Potential Potential Fluctuation Tail State Inert Layer 
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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • D. K. K. Lee
    • 1
  • J. M. F. Gunn
    • 2
  1. 1.Department of PhysicsUniversity of OxfordOxfordUnited Kingdom
  2. 2.School of Physics and Space ResearchUniversity of BirminghamBirminghamUnited Kingdom

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