Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Correlated Electrons: (General) Theory 1
TT 5.8: Vortrag
Montag, 20. März 2017, 11:30–11:45, HSZ 304
Fork Tensor Product States - Efficient Three Orbital Real Time DMFT Solver — •Daniel Bauernfeind, Manuel Zingl, Robert Triebl, Markus Aichhorn, and Hans Gerd Evertz — Institute of Theoretical and Computational Physics, Graz, Austria
We present a new tensor network especially suited for multi-orbital Anderson impurity models and, hence, also as an impurity solver for multi-orbital Dynamical Mean-Field Theory (DMFT). The solver works directly on the real-frequency axis, which yields very high spectral resolution at all frequencies. Within this approach one is not restricted by the number of bath sites, and can therefore achieve an accurate representation of the bath. Furthermore, this method can treat full-rotational invariant interactions with reasonable numerical effort. We show the efficiency and accuracy of the method by a benchmark for the testbed material SrVO3. There we observe a multiplet structure in the high-energy Hubbard bands which is almost impossible to resolve by other mulit-orbital methods. We also show that the resulting structure of the Hubbard bands can very well be explained by broadened atomic spectra with rescaled interaction parameters. This impurity solver offers a new route to the calculation of precise real-frequency spectral functions of correlated materials.