Wednesday, July 17, 2013

1307.4134 (Ricardo Gutierrez-Jauregui et al.)

Non linear magnetotransport theory and Hall induced resistance
oscillations in graphene

Ricardo Gutierrez-Jauregui, Manuel Torres
The quantum oscillations of nonlinear magnetoresistance in graphene that occurs 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 we develop a covariant formulation of the migration center theory. 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 exceeds a threshold value. This results are in good agreement with the experimental observations. At small magnetic field, the existence of Hall induced resistance oscillations are predicted for ultra clean graphene samples. These oscillations originate from Landau-Zener transitions between Landau levels, that are tilted by the strong electric Hall field.
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