Dresden 2017 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 34: Poster session II
MM 34.35: Poster
Tuesday, March 21, 2017, 18:30–20:30, P4
Single-spin hybridization expansion continuous-time Monte Carlo for time-dependent Anderson impurity model — •Patryk Kubiczek1, Alexey Rubtsov2, and Alexander Lichtenstein1 — 1Institute of Theoretical Physics, University of Hamburg, Germany — 2Russian Quantum Center, Moscov, Russia
In this work we propose a modified version of the standard continuous-time hybridization expansion quantum Monte Carlo method (CT-HYB-QMC) in which the expansion is performed only for a single-spin channel. At the same time the effective single-particle Schrödinger equation for the other spin-channel is solved explicitly. We apply this method to the time-dependent Anderson impurity model and show that it leads to the sign problem alleviation, which makes it possible to find the exact solutions of the model for larger timescales.