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HL: Fachverband Halbleiterphysik

HL 106: Transport, magnetotransport and quantum Hall physics

HL 106.1: Vortrag

Freitag, 20. März 2015, 10:00–10:15, EW 202

Fractional quantum Hall effect in monolayer and bilayer graphene: phase diagrams and edge excitations — •Maxim Kharitonov — Theoretische Physik IV, Universitaet Wuerzburg, 97074 Würzburg, Germany

We analytically investigate the fractional quantum Hall effect in monolayer and bilayer graphene at filling factors pertaining to the zero-energy Landau level, specifically concentrating on the order of the states in the valley-spin space. We obtain generic phase diagrams for the two-component states of arbitrary orbital structure, which turn out to be closely related to that of the ν=0 state. The transitions between different phases can in practice be realized by tilting the magnetic field and, in bilayer, by applying the perpendicular electric field. These transitions are accompanied by the transformations of the edge states, which could be detected in transport measurements.