Theory of anomalous dispersion in liquid He4

Ravindra N. Bhatt, W. L. McMillan

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Abstract

The zero-temperature dispersion curve in liquid He4 is calculated assuming anomalous dispersion, ω(k)=c k(1+γ2k2), in zeroth order and including three-phonon interactions within the continuum model. It is shown that the damped-phonon mode changes to a collective-type excitation at higher momenta. Estimates of γ at saturated vapor pressure and 10 atm are obtained from experimental data on the onset of the long-lived excitation in liquid He4.

Original languageEnglish (US)
Pages (from-to)1591-1597
Number of pages7
JournalPhysical Review A
Volume10
Issue number5
DOIs
StatePublished - Jan 1 1974
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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