Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Correlated Electrons: Metal-Insulator Transition 1

TT 34.2: Vortrag

Mittwoch, 28. März 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.
K. Byczuk et al., Nat. Phys. 3, 168 (2007).
C. Raas, P. Grete, and G. Uhrig, Phys. Rev. Lett. 102, 076406 (2009).
C. Knecht, N. Blümer, and P. G. J. van Dongen, Phys. Rev. Lett. 72, 081103 (2005).