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METAL INSULATOR TRANSITIONS IN STRONGLY CORRELATED SYSTEMS

05/02/2007

Campus Boucicaut

10:30

Séminaires Minéralogie

Salle non spécifiée

R. CHITRA

Laboratoire de Physique Théorique de la matière condensée, UPMC

Résumé: Metal insulator transitions in strongly correlated systems In this talk, we discuss metal insulator transitions in the Hubbardmodel with special emphasis on those driven by doping. The physics of doped Mott insulators is of immense relevance tohighTc materials and other transition metal oxides. A brief review of metal-insulator transitions in general will be presented, followed by a more elaborate description of magnetic transitions induced by doping at finite temperatures. The effect of magnetism on the physical properties of the system like the interacting density of states and the compressibility is studied in detail using slave bosons, dynamical mean field theory and quantum Monte Carlo methods. Interestingly, we find that the loss of magnetic order at finite temperatures is accompanied by an anomalous enhancement of the electronic compressibility. We also discuss the relevance of our results for experiments. -------------------------------------------------------------------------------- Séminaires Minéralogie --------------------------------------------------------------------------------