A simple model for the metal-insulator transition in a two-dimensional electron gas

Flores, J. C.; Bellani, V.; Dominguez-Adame, F.

A simple model for the metal-insulator transition in a two-dimensional electron gas

Authors

Flores, J. C.

Bellani, V.

Dominguez-Adame, F.

Description

We introduce an elementary model for the electrostatic self-consistent potential in a two-dimensional electron gas. By considering the perpendicular degree of freedom arising from the electron tunneling out of the system plane, we predict a threshold carrier density above which this effect is relevant. The predicted value agrees remarkably well with the onset for the insulator to quasi-metallic transition recently observed in several experiments in SiO2-Si and AlGaAs-GaAs heterojunctions.
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