Continuous-time auxiliary field Monte Carlo for quantum impurity models
Emanuel Gull, Philipp Werner, Olivier Parcollet, Matthias Troyer
TL;DR
This paper introduces a continuous-time Monte Carlo method for quantum impurity models that improves efficiency and accuracy over previous methods, especially for large cluster DMFT calculations.
Contribution
The paper presents a novel continuous-time auxiliary field Monte Carlo algorithm combining weak-coupling expansion with auxiliary-field decomposition, eliminating discretization errors.
Findings
More efficient than Hirsch-Fye Monte Carlo
Free of time discretization errors
Effective as impurity solver in large cluster DMFT
Abstract
We present a continuous-time Monte Carlo method for quantum impurity models, which combines a weak-coupling expansion with an auxiliary-field decomposition. The method is considerably more efficient than Hirsch-Fye and free of time discretization errors, and is particularly useful as impurity solver in large cluster dynamical mean field theory (DMFT) calculations.
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