Authors: Regina Burganova Yury Lysogorskiy Oleg Nedopekin Dmitrii Tayurskii
Publish Date: 2016/01/19
Volume: 185, Issue: 5-6, Pages: 392-398
Abstract
The study of the adsorption phenomenon of helium began many decades ago with the discovery of graphite as a homogeneous substrate for the investigation of physically adsorbed monolayer films In particular helium monoatomic layers on graphite were found to exhibit a very rich phase diagram In the present work we have investigated the adsorption phenomenon of helium atoms on graphene and silicene substrates by means of density functional theory with Born–Oppenheimer approximation Helium–substrate and helium–helium interactions were considered from first principles Vibrational properties of adsorbed monolayers have been used to explore the stability of the system This approach reproduces results describing the stability of a helium monolayer on graphene calculated by quantum Monte Carlo QMC simulations for low and high coverage cases However for the moderate coverage value there is a discrepancy with QMC results due to the lack of helium zero point motion
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