Jena 2013 – wissenschaftliches Programm

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MP: Fachverband Theoretische und Mathematische Grundlagen der Physik

MP 11: Gitterfeldtheorie 1

MP 11.2: Vortrag

Donnerstag, 28. Februar 2013, 12:25–12:50, HS 8

Monte-Carlo study of the density of states in graphene with Coulomb interactions — •Pavel Buividovich — Regensburg University, D-93053 Regensburg

I report on the numerical studies of the electronic properties of monolayer graphene, which were done by applying Hybrid Monte-Carlo techniques to the tight-binding model of graphene. The density of states was calculated from the particle number susceptibility with respect to the chemical potential. The results indicate that the Fermi velocity of charge carriers quickly increases as the interactions are turned on. As well, the logarithmic Fraunhofer singularity in the density of states, which is associated with the saddle point in the dispersion relation, becomes much more pronounced. I also discuss the interpretation of these findings in view of the recent experimental studies of the density of states in suspended graphene.