Low-temperature collapse of electron localization in two dimensions |
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Authors: | Baenninger Matthias Ghosh Arindam Pepper Michael Beere Harvey E Farrer Ian Ritchie David A |
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Affiliation: | Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom. matthias.baenninger@cantab.net |
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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. |
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