Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 84: Correlated Electrons: (General) Theory

TT 84.11: Vortrag

Donnerstag, 3. April 2014, 12:15–12:30, HSZ 304

Impurity solver based on Dynamical Density Matrix Renormalization Group — •Markus Greger and Marcus Kollar — Theoretische Physik III, Zentrum für Elektronische Korrelationen und Magnetismus, Universität Augsburg

We present a deconvolution-free extension of the dynamical density matrix renormalization group (DDMRG) for impurity problems. Our method is highly accurate in the low-energy sector and yields spectra that are comparable in resolution to the numerical renormalization group (NRG). The method is suitable as an impurity solver for multi-orbital dynamical mean-field theory (DMFT). We present results for the Green function, self-energy, and spin-susceptibility for multi-band Hubbard models, focusing on the effect of the Hund's rule coupling on these spectra at low-energies.