Metal to insulator transition on the N = 0 Landau level in graphene
Abstract
The magnetotransport in single layer graphene has been experimentally investigated in magnetic fields up to 18 T as a function of temperature. A pronounced T-dependence is observed for T < 50 K, which is either metallic, or insulating, depending on the filling factor nu. The metal-insulator transition (MIT) occurs at nuc ~ 0.65 and in the regime of the dissipative transport, where the longitudinal resistance Rxx > RK/2. The critical resistivity (Rxx per square) is rhoxx(nuc) ~ RK/2 and is correlated with the appearance of zero plateau in Hall conductivity sigmaxy(nu) and peaks in sigmaxx(nu). This leads us to construct a universal low-T (n, B) phase diagram of this quantum phase transition.
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