▎ 摘　　要

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 less than or similar to 50 K, which is either metallic, or insulating, depending on the filling factor nu. The metal-insulator transition (MIT) occurs at vertical bar nu(c)vertical bar similar to 0.65 and in the regime of the dissipative transport, where the longitudinal resistance R(xx) > 1/2 R(K). The critical resistivity (R(xx) per square) is rho(xx)(nu(c)) approximate to 1/2R(K) 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.