title: Low-temperature collapse of electron localization in two dimensions.
abstract: 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/e2. The results have been achieved by measuring transport on a mesoscopic length scale while systematically varying the strength of disorder.
authors.affiliation: Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom. matthias.baenninger@cantab.net
authors.forename: Matthias
authors.initials: M
authors.lastname: Baenninger
authors.forename: Arindam
authors.initials: A
authors.lastname: Ghosh
authors.forename: Michael
authors.initials: M
authors.lastname: Pepper
authors.forename: Harvey E
authors.initials: HE
authors.lastname: Beere
authors.forename: Ian
authors.initials: I
authors.lastname: Farrer
authors.forename: David A
authors.initials: DA
authors.lastname: Ritchie