Existence and nature of a helium monolayer film

Carlo Carraro, Milton W. Cole

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A variational calculation is presented of the energy of monolayer He films adsorbed on a surface. We find that the ground state of He4 is always a liquid, in agreement with the result for a strictly two-dimensional calculation, but in disagreement with results obtained recently with perturbation theory for the case of extremely weak adsorption potentials. The calculated energies provide a bound on the regime of parameter space corresponding to a bare surface ground state. For the most part, the latter is consistent with both the conclusions obtained recently with a density functional theory and with experiments showing nonwetting for He4 on Cs and Rb. For He3, calculations are presented under the assumption that the quasi-two-dimensional ground state is a gas. The resulting threshold potential for the monolayer to form is somewhat less attractive than in the He4 case.

Original languageEnglish (US)
Pages (from-to)10947-10951
Number of pages5
JournalPhysical Review B
Issue number17
StatePublished - 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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