Plateau insulator transition in graphene

الأصل · EN

The quantum Hall effect in a single-layer graphene sample is studied in strong magnetic fields up to 28 T. Our measurements reveal the existence of a metal- insulator transition from filling factor ν=-2 to ν=0. The value of the universal scaling exponent is found to be κ=0.57 in graphene and therefore in a truly two-dimensional system. This value of κ is in agreement with the accepted universal value for the plateau-insulator transitions in standard quasi two-dimensional electron and hole gases.