Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Correlated Electrons: Metal-Insulator Transition 1

TT 28.6: Vortrag

Donnerstag, 28. Februar 2008, 10:45–11:00, H 2053

Quantum phase transition in the two-band Hubbard model — •Theodoulos Costi and Ansgar Liebsch — Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich

The interaction between itinerant and Mott localized electronic states in strongly correlated transition metal oxide materials with anisotropic Hund’s exchange is studied within dynamical mean field theory in combination with the numerical renormalization group method . For values of the Hund’s exchange and Coulomb interactions typical of many transition metal oxides, a novel nonmagnetic zero temperature quantum phase transition is found in the bad-metallic orbital-selective Mott phase of the two-band Hubbard model [1]. We describe the critical properties of this quantum phase transition and relate the critical exponents to those of an exactly solvable model.

[1] T. A. Costi and A. Liebsch, Phys. Rev. Lett. (2007); arXiv:0707.4535