Observation of the ν=1 quantum Hall effect in a strongly localized two-dimensional system

Abstract

We observe a magnetic-field-driven transition in the two-dimensional electron system in GaAs/${\mathrm{Al}}_{\mathit{x}}$ ${\mathrm{Ga}}_{1\mathrm{-}\mathit{x}}$As, from a strongly localized insulating phase at B=0 to the integer quantum Hall phase that includes a fully developed ν=1 state. The quantum Hall phase terminates with an additional transition from the ν=1 state to an insulating phase.