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 . The results have been achieved by measuring transport on a mesoscopic length scale while systematically varying the strength of disorder.
- Received 23 July 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.016805
©2008 American Physical Society