Phase diagram of the metal-insulator transition in 2D electronic systems

Abstract

We investigated the interdependence of the effects of disorder and carrier correlations on the metal-insulator transition in two-dimensional electronic systems. We present a quantitative metal-insulator phase diagram. Depending on the carrier density we find two different types of metal-insulator transition - a continuous localization for rs=<8 and a discontinuous transition at higher rs. The critical level of disorder at the transition decreases with decreasing carrier density. At very low carrier densities we find that the system is always insulating. The value of the conductivity at the transition is consistent with recent experimental measurements. The self-consistent method which we have developed includes the effects of both disorder and correlations on the transition, using a density relaxation theory with the Coulomb correlations determined from numerical simulation data.

4 pages, RevTeX + epsf, 5 figures. New comments on conducting phase and on the conductivity. References updated and corrected

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• Effect of Local Magnetic Moments on the Metallic Behavior in Two Dimensions
• Analysis of the Metallic Phase of Two-Dimensional Holes in SiGe in Terms of Temperature Dependent Screening
• Noise at the Wigner Glass Transition
• Quantum critical scaling for finite temperature Mott-like metal-insulator crossover in a few layered-MoS${}_2$
• Aging Effects Across the Metal-Insulator Transition in Two Dimensions
• Classical versus Quantum Effects in the B=0 Conducting Phase in Two Dimensions
• Interacting spin-droplets and magnetic properties of a low-density two-dimensional electron gas
• Does spin-orbit coupling play a role in metal-nonmetal transition in two-dimensional systems?
• Glass Transition in a Two-Dimensional Electron System in Silicon in a Parallel Magnetic Field