engleski

4He clusters adsorbed on graphene

We report the results of the study of 4HeN clusters adsorbed on one and both sides of a graphene sheet. Interactions of 4He clusters with graphene are modelled using an averaged helium-carbon potential that depends only on the distance to the graphene sheet, and a potential constructed as a sum of individual heliumcarbon interactions. That way, we assess the effect of corrugation on the binding properties of helium clusters. All the calculations have been performed using quantum Monte Carlo methods. At zero temperature the ground-state properties of 4HeN for 2≤ N ≤50 have been determined using variational and diffusion Monte Carlo calculations. We find that clusters adsorbed on both sides of graphene are correlated. In addition, we observe the changes in the size of the clusters. For selected larger clusters, calculations have been performed also at finite temperature by path integral Monte Carlo simulations.

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