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Exact real-time dynamics of single-impurity Anderson model from a single-spin hybridization-expansionстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Kubiczek Patryk, Rubtsov Alexey, Lichtenstein Alexander
- Журнал: SciPost Physics
- Том: 7
- Номер: 2
- Год издания: 2019
- Издательство: SciPost Foundation
- Местоположение издательства: Netherlands
- DOI: 10.21468/scipostphys.7.2.016
- Аннотация: In this work we introduce 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 semi-analytically for each expansion diagram. CT-1/2-HYB-QMC 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. We illustrate the new solver by calculating an electric current through impurity in paramagnetic and spin-polarized cases.
- Добавил в систему: Рубцов Алексей Николаевич