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Delocalized Coulomb phase in two dimensions

Xavier Waintal·Giuliano Benenti·Jean-Louis Pichard
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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.

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Xavier Waintal, Giuliano Benenti, Jean-Louis Pichard. 1999-12-08. Delocalized Coulomb phase in two dimensions. https://doi.org/10.1209/epl%2Fi2000-00172-5

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