Nonlinear magnetotransport theory and Hall induced resistance oscillations in graphene.
The quantum oscillations of nonlinear magnetoresistance in graphene that occur in response to a dc current bias are investigated. We present a theoretical model for the nonlinear magnetotransport of graphene carriers. The model is based on the exact solution of the effective Dirac equation in crossed electric and magnetic fields, while the effects of randomly distributed impurities are perturbatively added. To compute the nonlinear current effects, we develop a covariant formulation of the migration center theory. The current is calculated for short- and large-range scatterers. The analysis of the differential resistivity in the large magnetic field region, shows that the extrema of the Shubnikov de Hass oscillations invert when the dc currents exceed a threshold value. These results are in good agreement with experimental observations. In the small magnetic field regime, corresponding to large filling factors, the existence of Hall induced resistance oscillations are predicted for ultra clean graphene samples. These oscillations originate from Landau-Zener tunneling between Landau levels, that are tilted by the strong electric Hall field.
Departamento de Física Teórica, Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20-364, México Distrito Federal 01000, México, USA.
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R
Gutiérrez-Jáuregui
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M
Torres
D004560:Electricity; D006108:Graphite / Q000737:chemistry*; D060526:Magnetic Fields; D008956:Models, Chemical; D056004:Molecular Dynamics Simulation; D015394:Molecular Structure; D011789:Quantum Theory
D006108:Graphite