Structural and dynamical properties of superfluid helium: a density functional approach

Details Structural and dynamical properties of superfluid helium: a density functional approach Structural and dynamical properties of superfluid helium: a density functional approach

1994-12-21

arxiv.org/abs/cond-mat/9412095v1

Physics

Condensed Matter

37 pages, REVTeX 3.0, figures on request at dalfovo@science.unitn.it

Scientific paper

10.1103/PhysRevB.52.1193

We present a novel density functional for liquid 4He, properly accounting for the static response function and the phonon-roton dispersion in the uniform liquid. The functional is used to study both structural and dynamical properties of superfluid helium in various geometries. The equilibrium properties of the free surface, droplets and films at zero temperature are calculated. Our predictions agree closely to the results of ab initio Monte Carlo calculations, when available. The introduction of a phenomenological velocity dependent interaction, which accounts for backflow effects, is discussed. The spectrum of the elementary excitations of the free surface and films is studied.

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