Density functional calculations for 4He droplets

Abstract

A novel density functional, which accounts correctly for the equation of state, the static response function and the phonon-roton dispersion in bulk liquid helium, is used to predict static and dynamic properties of helium droplets. The static density profile is found to exhibit significant oscillations, which are accompanied by deviations of the evaporation energy from a liquid drop behaviour in the case of small droplets. The connection between such oscillations and the structure of the static response function in the liquid is explicitly discussed. The energy and the wave function of excited states are then calculated in the framework of time dependent density functional theory. The new functional, which contains backflow-like effects, is expected to yield quantitatively correct predictions for the excitation spectrum also in the roton wave-length range.

15 pages, REVTEX, 10 figures available upon request or at http://anubis.science.unitn.it/~dalfovo/papers/papers.html

References in corpus (2)

• Structural and dynamical properties of superfluid helium: a density functional approach
• Dispersion of Ripplons in Superfluid 4he

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• Quantum Evaporation from the Free Surface of Superfluid 4He
• Dynamics of liquid He-4 in confined geometries from Time-Dependent Density Functional calculations
• Multipole response of doped ${}^3$He drops
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