Phase diagram of ${}^4$He on graphene

Abstract

The low temperature phase diagram of ${}^4$He adsorbed on a single graphene sheet is studied by computer simulation of a system comprising nearly thousand helium atoms. In the first layer, two commensurate solid phases are observed, with fillings 1/3 and 7/16 respectively, separated by a domain wall phase, as well as an incommensurate crystal at higher coverage. No evidence of a thermodynamically stable superfliuid phase is found for the first adlayer. Second layer promotion occurs at a coverage of 0.111(4) ${\mathring{A}}^{-2}$. In the second layer two phases are observed, namely a superfluid and an incommensurate solid, with no commensurate solid intervening between these two phases. The computed phase diagram closely resembles that predicted for helium on graphite.

5 pages, 5 figures. Replaced with published version

References in corpus (5)

• The structure of suspended graphene sheets
• Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
• Phase diagram of 4He adsorbed on graphite
• 4He on a single graphene sheet
• Population size bias in Diffusion Monte Carlo

Cited by in corpus (19)

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• Specific heat of thin ${}^4$He films on graphite
• Commensurate-incommensurate solid transition in the ${}^4$He monolayer on $\gamma$-graphyne
• A Perspective on Collective Properties of Atoms on 2D Materials
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• Quantum Monte Carlo study of thin parahydrogen films on graphite
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• He-4 monolayer on Graphene: a Quantum Monte Carlo study
• Combining Harmonic Sampling with the Worm Algorithm to Improve the Efficiency of Path Integral Monte Carlo
• Accurate Helium-Benzene Potential: from CCSD(T) to Gaussian Process Regression