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