Specific heat of thin ${}^4$He films on graphite

Abstract

The specific heat of a two-layer He-4 film adsorbed on a graphite substrate is estimated as a function of temperature by Quantum Monte Carlo simulations. The results are consistent with recent experimental observations, in that they broadly reproduce their most important features. However, neither the "supersolid" nor the "superfluid hexatic" phases, of which experimental data are claimed to be evidence, are observed. It is contended that heat capacity measurements alone may not be a good predictor of structural and superfluid transitions in this system, as their interpretation is often ambiguous.

arXiv commentReplaced with published version

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• Superfluid transition and specific heat of the 2D x-y model: Monte Carlo simulation
• Superfluid transition of the second layer of He-4 on graphite: does substrate corrugation matter?
• Phase diagram and crystal melting of helium-4 in two dimensions
• He-4 monolayer on Graphene: a Quantum Monte Carlo study
• Effects of substrate corrugation during helium adsorption on graphene in the grand canonical ensemble
• On the Novel Superfluidity in the Second Layer of ${}^4$He on Graphite