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Theory of the Phonon-Roton Spectrum of Liquid 4He

  • C. E. Campbell
Part of the NATO ASI Series book series (NSSB, volume 257)

Abstract

The theory of the excited states of boson fluids, and particularly liquid 4He, has been the subject of attention for nearly fifty years, beginning with Landau’s observation in 1941 that the unusual properties of liquid 4He at temperatures well below the λ point could be understood in terms of a phonon and roton spectrum of excited states.1 Subsequently Landau asserted without proof that the phonons and rotons were part of a single, continuous spectrum as a function of momentum,2 having essentially the same form as is presently widely accepted.

Keywords

Excitation Spectrum Ground State Wave Function Boson System Condensate Fraction Excited State Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • C. E. Campbell
    • 1
  1. 1.School of Physics and AstronomyUniversity of MinnesotaMinneapolisUSA

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