Matches in SemOpenAlex for { <https://semopenalex.org/work/W2068442051> ?p ?o ?g. }
- W2068442051 abstract "We have performed path-integral Monte Carlo calculations to study ${}^{4}$He adsorption on a single graphene sheet. The ${}^{4}$He-substrate interaction was assumed to be a pairwise sum of the helium-carbon potentials constructed by Carlos and Cole to fit helium scattering data from a graphite surface. We employed both an anisotropic 6-12 Lennard-Jones potential and a spherical 6-12 potential. For both potentials, the first ${}^{4}$He layer has the C${}_{1/3}$ commensurate structure at a surface density of 0.0636 AA{}${}^{ensuremath{-}2}$. Vacancy states created in the C${}_{1/3}$ commensurate solid, however, behave differently depending on the ${}^{4}$He-substrate interaction: a cluster of localized vacancies are formed with the fully anisotropic 6-12 pair potentials while mobile vacancies are found to induce finite superfluid fractions with the substrate potential based on only the isotropic parts of the inter-atomic pair potentials. For the second helium layer we find that exchange among ${}^{4}$He adatoms results in quantum melting of a C${}_{7/12}$ commensurate structure, which is registered to a first-layer triangular solid. The possible stabilization of this commensurate structure with the addition of ${}^{3}$He impurities is discussed." @default.
- W2068442051 created "2016-06-24" @default.
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- W2068442051 date "2012-06-04" @default.
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- W2068442051 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mrow /><mml:mn>4</mml:mn></mml:msup></mml:math>He adsorption on a single graphene sheet: Path-integral Monte Carlo study" @default.
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- W2068442051 doi "https://doi.org/10.1103/physrevb.85.224501" @default.
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