Berlin 2018 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 72: Poster Session: Correlated Electrons

TT 72.82: Poster

Wednesday, March 14, 2018, 15:00–19:00, Poster B

CT-1/2-HYB-QMC: a new solver for time-dependent Anderson impurity — •Patryk Kubiczek¹, Alexey N. Rubtsov^2,3, and Alexander I. Lichtenstein¹ — ¹I. Institute for Theoretical Physics, University of Hamburg, Hamburg, Germany — ²Department of Physics, Lomonosov Moscow State University, Moscow, Russia — ³Russian Quantum Centre, Skolkovo, Russia

We report on the progress of the development of a modified real-time continuous-time hybridization-expansion quantum Monte Carlo solver for a time-dependent single-orbital Anderson impurity model: CT-1/2-HYB-QMC. In the proposed method the diagrammatic expansion is performed only for one out of the two spin channels, while the resulting effective single-particle problem for the other spin is solved explicitly for each diagrammatic term. We show that the CT-1/2-HYB-QMC method alleviates the dynamical sign problem by reducing the order of sampled diagrams and makes it possible to reach twice as long time scales in comparison to the standard CT-HYB method. Moreover, the structure of CT-1/2-HYB perturbative expansion leads to an easier and less computationally expensive measurement of the charge current.