Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 8: Correlated Electrons: Quantum Impurities, Kondo Physics

TT 8.3: Talk

Monday, March 7, 2016, 10:45–11:00, H21

The numerical renormalization group and symmetric multi-orbital models — •Andreas Weichselbaum¹, Katharina Stadler¹, Jan von Delft¹, Zhiping Yin², Gabriel Kotliar², and Andrew Mitchell³ — ¹Ludwig Maximilians University, Munich, Germany — ²Rutgers University, New Jersey, USA — ³Utrecht University, The Netherlands

The numerical renormalization group (NRG) is a highly versatile and accurate method for the simulation of (effective) fermionic impurity models. Despite that the cost of NRG is exponential in the number of orbitals, by now, symmetric three-band calculations have become available on a routine level. [1] Here we present a recent detailed study on the spin-orbital separation in a three-band Hund metal with relevance for iron-pnictides via the dynamical mean field theory (DMFT). [2] In cases, finally, where the orbital symmetry is broken, we demonstrate that interleaved NRG [3] still offers an accurate alternative approach within the NRG with dramatically improved numerical efficiency at comparable accuracy relative to conventional NRG.
A. Weichselbaum, Annals of Physics 327, 2972 (2012)
K. Stadler et al., PRL 115, 136401 (2015)
A. Mitchell et al., PRB 89, 121105(R) (2014)