Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.35: Poster

Dienstag, 21. März 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.