Metal-Insulator Transition in a Disordered Two-Dimensional Electron Gas in GaAs-AlGaAs at zero Magnetic Field
Abstract
A metal-insulator transition in two-dimensional electron gases at B=0 is found in Ga(Al)As heterostructures, where a high density of self-assembled InAs quantum dots is incorporated just 3 nm below the heterointerface. The transition occurs at resistances around h/e2 and critical carrier densities of 1.2 1011cm-2. Effects of electron-electron interactions are expected to be rather weak in our samples, while disorder plays a crucial role.
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