Diagrammatic Monte Carlo for dissipative quantum impurity models

被引:7
作者
Vanhoecke, Matthieu [1 ]
Schiro, Marco [1 ]
机构
[1] PSL Res Univ, CNRS, Coll France, JEIP,UAR 3573, 11 Pl Marcelin Berthelot, F-75231 Paris 05, France
基金
欧洲研究理事会;
关键词
THERMO FIELD-DYNAMICS; TRANSPORT; SYSTEMS;
D O I
10.1103/PhysRevB.109.125125
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We develop a diagrammatic Monte Carlo method for the real-time dynamics of dissipative quantum impurity models. These are small open quantum systems with interaction and local Markovian dissipation, coupled to a large quantum bath. Our algorithm samples the hybridization expansion formulated on a single real-time contour, rather than on the double Keldysh one, as it naturally arises in the thermofield/vectorized representation of the Lindblad dynamics. We show that local Markovian dissipation generally helps the convergence of the diagrammatic Monte Carlo sampling by reducing the sign problem, thus allowing to reach longer timescales as compared to the conventional unitary case. We apply our method to an Anderson impurity model in the presence of local dephasing and discuss its effect on the charge and spin dynamics of the impurity.
引用
收藏
页数:17
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