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Metal to insulator transition on the N = 0 Landau level in graphene

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 nu_c ~ 0.65 and in the regime of the dissipative transport, where the longitudinal resistance Rxx > R_K/2. The critical resistivity (Rxx per square) is rho_xx(nu_c) ~ R_K/2 and is correlated with the appearance of zero plateau in Hall conductivity sigma_xy(nu) and peaks in sigma_xx(nu). This leads us to construct a universal low-T (n, B) phase diagram of this quantum phase transition.

preprint2010arXivOpen access
L. ZhangY. ZhangM. KhodasT. VallaI. A. Zaliznyak
cond-mat.mes-hallcond-mat.str-el
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L. ZhangY. ZhangM. KhodasT. VallaI. A. Zaliznyak

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