Elementary Excitations in Liquid Helium

  • Chia-Wei Woo


Recently certain controversies have arisen over the form and direction of the phonon dispersion and the nature of the two-roton excitation in liquid helium. From the standpoint both of theoretical elegance and of satisfactorily interpreting experimental data in a way consistent with sum rules, it is highly desirable to develop a theory which accounts for the two branches of excitations on equal footing, at least in the limit of long wavelengths. We discuss here such an attempt. It is a microscopic theory based on a generalization of Feynman’s treatment of the phonon-roton spectrum.


Liquid Helium Phonon Dispersion Elementary Excitation Trial Wave Function Dynamic Structure Function 
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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • Chia-Wei Woo
    • 1
  1. 1.Department of PhysicsNorthwestern UniversityEvanstonUSA

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