Wednesday, June 12, 2013

1306.2544 (V. V. Braguta et al.)

Interaction of static charges in graphene within Monte-Carlo simulation    [PDF]

V. V. Braguta, S. N. Valgushev, A. A. Nikolaev, M. I. Polikarpov, M. V. Ulybyshev
The study of the interaction potential between static charges within Monte-Carlo simulation of graphene is carried out. The numerical simulations are performed in the effective lattice field theory with noncompact $3 + 1$-dimensional Abelian lattice gauge fields and $2 + 1$-dimensional staggered lattice fermions. It is shown that for all considered temperatures the interaction can be well described by the Debye screened potential created by two-dimensional electron-hole excitations. At low temperatures Debye mass $m_D$ plays a role of order parameter of the insulator-semimetal phase transition. In the semimetal phase at high temperature graphene reveals the properties of weakly interacting two-dimensional plasma of fermions excitations.
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