We calculate the size and energy of distortions of solid 3He and 4He monolayers produced by the periodic potential of a graphite substrate, as a function of relative orientation angle of the incommensurate adsorbate and substrate lattices, using experimental elastic parameters of the monolayers, Fourier components of the substrate potential obtained from atomic scattering, and a phenomenological treatment of adsorbate phonons. We also predict the restoring force against relative twist of the two lattices, a parameter needed in analyzing the melting transition.
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Work supported in part by Department of Energy Contract #DE-AM03-76SF00767.
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Greif, J.M., Goodstein, D.L. Orientational ordering in incommensurate solid helium monolayers on graphite. J Low Temp Phys 44, 347–366 (1981). https://doi.org/10.1007/BF00120782
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DOI: https://doi.org/10.1007/BF00120782