Delocalized Coulomb phase in two dimensions
CEA, Service de Physique de l'Etat Condensé,
Centre d'Etudes de Saclay F-91191 Gif-sur-Yvette cedex, France
Accepted: 5 December 1999
Extending the 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 , where a change in the nature of the persistent currents has been previously observed. Relevance to the recently observed 2d metallic phase is suggested.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 72.15.Rn – Localization effects (Anderson or weak localization) / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, 2000