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Published on: January 21, 2016
The effect of spin mixing on the quantum Hall effect in graphene
1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
Abstract:
On the basis of a tight-binding model, we study numerically the effect of Rashba spin-orbit coupling on the quantum Hall effect in graphene. It is found that the spin-orbit coupling can open a gap in the energy spectrum of the counterpropagating edge states in the ν = 0 plateau region, while the edge states in other plateau regions remain gapless. In the presence of disorder, the energy spectrum in the ν = 0 plateau region shows the feature of level repulsion, an indication of switching on of backward scattering and localization of the edge states. This result may explain the insulator-like behavior near the Dirac points observed in experiments at low temperatures.
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