Naslov
4He clusters adsorbed on graphene

Autori
Vranješ Markić, Leandra

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Future Prospects in Many Particle Theory (FPMPT) Abstract Book / --- - Linz : Johannes Kepler Universität Linz - Institute for Theoretical Physics, 2012, -----

Skup
Future Prospects in Many Particle Theory (FPMPT) Workshop

Mjesto i datum
Linz, Austrija, 25.06.2012. - 27.06.2012

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
4He clusters; graphene

Sažetak
The results of the recent study of 4HeN clusters adsorbed on one and both sides of a graphene sheet will be presented. Interactions of 4He clusters with graphene are modeled using a smooth helium- carbon potential that depends only on the distance to the graphene sheet, and a potential constructed as a sum of individual helium-carbon interactions where two possibilities for this He-C interaction are tested. That way, we assess the effect of corrugation on the binding properties of helium clusters. Furthermore the influence that the graphene-mediated McLachlan dispersion energy has on the He-He interaction has been studied. The McLachlan interaction weakens the attraction between helium atoms, which has a significant effect on the binding energy and shape of adsorbed 4He clusters. All the calculations have been performed using quantum Monte Carlo methods. At zero temperature the ground-state properties of 4HeN for 1<N<41 are determined using variational and diffusion Monte Carlo calculations, and in addition path integral Monte Carlo simulations at finite temperature have been performed for some selected cluster sizes. We find that clusters adsorbed on both sides of graphene are bound but according to the He-He pair distribution function across the graphene sheet pair correlations are very small.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA