Delocalized Coulomb phase in two dimensions

Abstract

Extending finite size scaling theory to the many body ground state, one finds that Coulomb repulsion can drive a system of spinless fermions in a random potential from the Anderson insulator (Fermi glass of localized states) towards a new extended phase in dimension $d=2$. The transition occurs at a Coulomb energy to Fermi energy ratio $r_s\approx 4$, where a change in the nature of the persistent currents has been previously observed. Relevance to the recently observed $2d$ metallic phase is suggested.

7 pages, 3 figures, to be published in Europhys. Lett

References in corpus (2)

• Nonmonotonic Temperature-dependent Resistance in Low Density 2D Hole Gases
• A new quantum phase between the Fermi glass and the Wigner crystal in two dimensions

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• No indications of metal-insulator transition for systems of interacting electrons in two dimensions
• Spin Polarized Ground State for Interacting Electrons in Two Dimensions
• Signatures of an intermediate 2d Coulomb phase at low temperatures
• The Parallel Magnetoconductance of Interacting Electrons in a Two Dimensional Disordered System
• A numerical finite size scaling approach to many-body localization
• Ground state properties of the 2D disordered Hubbard model
• Strongly correlated Fermi-Bose mixtures in disordered optical lattices
• Persistent currents in two dimensions: New regimes induced by the interplay between electronic correlations and disorder
• From the Fermi Liquid Towards the Wigner Solid in Two Dimensions