Low-Temperature Collapse of Electron Localisation in Two Dimensions

Details Low-Temperature Collapse of Electron Localisation in Two Dimensions Low-Temperature Collapse of Electron Localisation in Two Dimensions

2007-11-09

arxiv.org/abs/0711.1464v1

Phys. Rev. Lett. 100, 016805 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures To appear in PRL

Scientific paper

10.1103/PhysRevLett.100.016805

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.

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