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