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TT: Fachverband Tiefe Temperaturen

TT 35: Low-Dimensional Systems: 2D - Theory

TT 35.3: Vortrag

Dienstag, 21. März 2017, 14:30–14:45, HSZ 304

Interaction induced gap of magnetic Graphene — •zhenjiu wang and fakher. f. assaad — Institut für Theoretische Physik und Astrophysik , Universität Würzburg, Germany

We investigate the interaction induced ordered state of relativistic Landau Levels by means of unbiased lattice quantum Monte Carlo simulations. The model we consider is a Hubbard hamiltonian on the honeycomb lattice in the presence of an orbital magnetic field and supplemented by a nearest neighbor interaction such that at the classical level charge density wave and spin density wave states are degenerate. Our calculations show that the magnetic field induced flat band is unstable towards magnetic ordering. As one approaches Gross-Neveu quantum criticality the single particle gap shows a crossover behavior from linear to square root scaling as a function of magnetic field.