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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 84: Correlated Electrons: (General) Theory

TT 84.7: Talk

Thursday, April 3, 2014, 11:00–11:15, HSZ 304

Quasi-continuous-time impurity solver for the cluster dynamical mean-field theory with linear scaling in the inverse temperature — •Daniel Rost1,2, Nils Blümer1, and Fakher F. Assaad31Institute of Physics, Johannes Gutenberg University, Mainz, Germany — 2Graduate School Materials Science in Mainz, Johannes Gutenberg University, Mainz, Germany — 3Institute of Theoretical Physics and Astrophysics, University of Würzburg, Germany

We present an extension to cellular dynamical mean-field theory (CDMFT) of an recently developed unbiased quantum Monte Carlo (QMC) impurity solver for single-site DMFT [1]. The novel algorithm is based on a multigrid version of BSS-QMC [2,3], which yields Green functions free of significant Trotter errors, and scales linearly with the inverse temperature β=1/T and cubically in the cluster size N. We use the superior scaling to explore ultra-low temperature regimes at moderate cluster sizes, not reachable with state-of-the-art continuous time QMC impurity solvers that scale cubically in β.
D. Rost, F. Assaad and N. Blümer, PRE 87, 053305 (2013)
E. Khatami et al., PRE 81, 056703 (2010)
R. Blankenbecler, D. Scalapino, R. Sugar, PRD 24, 2278 (1981)

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