Effects of crystalline substrate potentials on quasi-two-dimensional liquid helium

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Effects of crystalline substrate potentials on quasi-two-dimensional liquid helium

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Title: Effects of crystalline substrate potentials on quasi-two-dimensional liquid helium
Author: Novaco, Anthony D.; Campbell, C. E.
Abstract: The effects of a finite substrate-helium interaction and of the crystalline structure of a substrate potential on the liquid phase of a monolayer of helium are explored for models of three systems: helium physisorbed on a basal-plane surface of graphite; 4He adsorbed on graphite preplated by a close-packed layer of neon; and 4He adsorbed on graphite preplated by a close-packed layer of argon. The ground-state energy as a function of the areal density is calculated for each of these models by introducing a class of trial wave functions which have finite extent orthogonal to the substrate, possess the same translational symmetry as the substrate, and include short-range correlations between the helium atoms. The results for 4He on bare graphite are virtually identical with previous results for the model of 4He atoms in a two-dimensional structureless box, with very small quantitative differences. The indications for 3He on bare graphite are that the liquid is not self-bound. In contrast to the bare-graphite substrate, the other two substrates exert a strong influence on the liquid, substantially increasing the equilibrium density.
URI: http://hdl.handle.net/10385/823
Date: 1975-04-01

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