Speaker
Mr
Alexander Nikolaev
(Far Eastern Federal University)
Description
Tight-binding model of the AA-stacked bilayer graphene with screened
electron-electron interactions has been studied using the Hybrid Monte
Carlo simulations on the original double-layer hexagonal lattice.
Instantaneous screened Coulomb potential is taken into account using
Hubbard-Stratonovich transformation. G-type antiferromagnetic ordering has been studied and the phase transition with spontaneous generation of the mass gap has been observed. Dependence of the energy gap on the on-site electron-electron interaction is examined. It is found, that the energy gap vanishes at some finite value of the on-site interaction potential, which differs from the dependence, predicted by the mean-field approximation.
Primary author
Mr
Alexander Nikolaev
(Far Eastern Federal University)
Co-author
Dr
Maksim Ulybyshev
(Regensburg University)
