We report direct experimental evidence that the insulating phase of a disordered, yet strongly interacting two-dimensional electron system (2DES) becomes unstable at low temperatures. As the temperature decreases, a transition from insulating to metal-like transport behaviour 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.
@article{arxiv.0711.1464,
title = {Low-Temperature Collapse of Electron Localisation in Two Dimensions},
author = {M. Baenninger and A. Ghosh and M. Pepper and H. E. Beere and I. Farrer and D. A. Ritchie},
journal= {arXiv preprint arXiv:0711.1464},
year = {2008}
}