Metal-Insulator Transition in Disordered Two-Dimensional Electron Systems

Details Metal-Insulator Transition in Disordered Two-Dimensional Electron Systems Metal-Insulator Transition in Disordered Two-Dimensional Electron Systems

2005-11-12

arxiv.org/abs/cond-mat/0511305v1

Science 310, 289 (2005)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

10.1126/science.1115660

We present a theory of the metal-insulator transition in a disordered two-dimensional electron gas. A quantum critical point, separating the metallic phase which is stabilized by electronic interactions, from the insulating phase where disorder prevails over the electronic interactions, has been identified. The existence of the quantum critical point leads to a divergence in the density of states of the underlying collective modes at the transition, causing the thermodynamic properties to behave critically as the transition is approached. We show that the interplay of electron-electron interactions and disorder can explain the observed transport properties and the anomalous enhancement of the spin susceptibility near the metal-insulator transition.

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