Dispersion of Ripplons in Superfluid 4he

Details Dispersion of Ripplons in Superfluid 4he Dispersion of Ripplons in Superfluid 4he

1994-04-18

arxiv.org/abs/cond-mat/9404051v1

Physics

Condensed Matter

23 pages, REVTEX 3.0, 11 figures upon request, UTF-326/94

Scientific paper

10.1007/BF00753615

A detailed study of the dispersion law of surface excitations in liquid \hef at zero temperature is presented, with special emphasis to the short wave length region. The hybridization mechanism between surface and bulk modes is discussed on a general basis, investigating the scattering of slow rotons from the surface. An accurate density functional, accounting for backflow effects, is then used to determine the dispersion of both bulk and surface excitations. The numerical results are close to the experimental data obtained on thick films and explicitly reveal the occurrence of important hybridization effects between ripplons and rotons.

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