Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: Metal-Insulator Transition 1

TT 34.2: Talk

Wednesday, March 28, 2012, 16:45–17:00, H 3010

Emergence of a joint low-energy scale close to the orbital-selective Mott transition — •Markus Greger, Marcus Kollar, and Dieter Vollhardt — Theoretical Physics III, Electronic Correlations and Magnetism, Universität Augsburg

We investigate the microscopic precondition for the appearance of kinks in the self-energy [1] and their relation to low-energy spin-excitations [2] within the framework of Dynamical Mean Field Theory. To this end we investigate the two-band Hubbard model with unhybridized, differently correlated orbitals close to the orbital selective Mott transition [3]. We find the emergence of one common energy-scale which is shared by the self-energy kinks and the diagonal spin-susceptibilities. A physical explanation of this energy-scale is obtained from a minimal Kondo-type model.
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