%N 1 %J PHYS REV LETT %K METAL-INSULATOR-TRANSITION, QUANTUM HALL LIQUID, ANDERSON TRANSITION, GROUND-STATE, CONDUCTIVITY, DENSITY, GAS, SYSTEMS, LATTICE, FIELD %L discovery1314472 %V 100 %D 2008 %O © 2008 The American Physical Society %T Low-temperature collapse of electron localization in two dimensions %X We report direct experimental evidence that the insulating phase of a disordered, yet strongly interacting two-dimensional electron system becomes unstable at low temperatures. As the temperature decreases, a transition from insulating to metal-like transport behavior is observed, which persists even when the resistivity of the system greatly exceeds the quantum of resistivity h/e(2). The results have been achieved by measuring transport on a mesoscopic length scale while systematically varying the strength of disorder. %A M Baenninger %A A Ghosh %A M Pepper %A HE Beere %A I Farrer %A DA Ritchie %I AMER PHYSICAL SOC