Stochastic Equation of Motion Approach to Fermionic Dissipative Dynamics. II. Numerical Implementation
Abstract
This paper provides a detailed account of the numerical implementation of the stochastic equation of motion (SEOM) method for the dissipative dynamics of fermionic open quantum systems. To enable direct stochastic calculations, a minimal auxiliary space (MAS) mapping scheme is adopted, with which the time-dependent Grassmann fields are represented by c-numbers noises and a set of pseudo-operators. We elaborate on the construction of the system operators and pseudo-operators involved in the MAS-SEOM, along with the analytic expression for the particle current. The MASSEOM is applied to study the relaxation and voltage-driven dynamics of quantum impurity systems described by the single-level Anderson impurity model, and the numerical results are benchmarked against those of the highly accurate hierarchical equations of motion (HEOM) method. The advantages and limitations of the present MAS-SEOM approach are discussed extensively.
Cite
@article{arxiv.1912.05271,
title = {Stochastic Equation of Motion Approach to Fermionic Dissipative Dynamics. II. Numerical Implementation},
author = {Arif Ullah and Lu Han and Yun-An Yan and Xiao Zheng and YiJing Yan and Vladimir Chernyak},
journal= {arXiv preprint arXiv:1912.05271},
year = {2020}
}