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Title: Stochastic equation of motion approach to fermionic dissipative dynamics. I. Formalism

Abstract

In this work, we establish formally exact stochastic equation of motion (SEOM) theory to describe the dissipative dynamics of fermionic open systems. The construction of the SEOM is based on a stochastic decoupling of the dissipative interaction between the system and fermionic environment, and the influence of environmental fluctuations on the reduced system dynamics is characterized by stochastic Grassmann fields. Meanwhile, numerical realization of the time-dependent Grassmann fields has remained a long-standing challenge. To solve this problem, we propose a minimal auxiliary space (MAS) mapping scheme with which the stochastic Grassmann fields are represented by conventional c-number fields along with a set of pseudo-levels. This eventually leads to a numerically feasible MAS-SEOM method. The important properties of the MAS-SEOM are analyzed by making connection to the well-established time-dependent perturbation theory and the hierarchical equations of motion theory. The MAS-SEOM method provides a potentially promising approach for the accurate and efficient simulation of fermionic open systems at ultra-low temperatures.

Authors:
ORCiD logo; ; ORCiD logo; ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1630974
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Name: Journal of Chemical Physics Journal Volume: 152 Journal Issue: 20; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics
Country of Publication:
United States
Language:
English

Citation Formats

Han, Lu, Ullah, Arif, Yan, Yun-An, Zheng, Xiao, Yan, YiJing, and Chernyak, Vladimir. Stochastic equation of motion approach to fermionic dissipative dynamics. I. Formalism. United States: N. p., 2020. Web. doi:10.1063/1.5142164.
Han, Lu, Ullah, Arif, Yan, Yun-An, Zheng, Xiao, Yan, YiJing, & Chernyak, Vladimir. Stochastic equation of motion approach to fermionic dissipative dynamics. I. Formalism. United States. https://doi.org/10.1063/1.5142164
Han, Lu, Ullah, Arif, Yan, Yun-An, Zheng, Xiao, Yan, YiJing, and Chernyak, Vladimir. Wed . "Stochastic equation of motion approach to fermionic dissipative dynamics. I. Formalism". United States. https://doi.org/10.1063/1.5142164.
@article{osti_1630974,
title = {Stochastic equation of motion approach to fermionic dissipative dynamics. I. Formalism},
author = {Han, Lu and Ullah, Arif and Yan, Yun-An and Zheng, Xiao and Yan, YiJing and Chernyak, Vladimir},
abstractNote = {In this work, we establish formally exact stochastic equation of motion (SEOM) theory to describe the dissipative dynamics of fermionic open systems. The construction of the SEOM is based on a stochastic decoupling of the dissipative interaction between the system and fermionic environment, and the influence of environmental fluctuations on the reduced system dynamics is characterized by stochastic Grassmann fields. Meanwhile, numerical realization of the time-dependent Grassmann fields has remained a long-standing challenge. To solve this problem, we propose a minimal auxiliary space (MAS) mapping scheme with which the stochastic Grassmann fields are represented by conventional c-number fields along with a set of pseudo-levels. This eventually leads to a numerically feasible MAS-SEOM method. The important properties of the MAS-SEOM are analyzed by making connection to the well-established time-dependent perturbation theory and the hierarchical equations of motion theory. The MAS-SEOM method provides a potentially promising approach for the accurate and efficient simulation of fermionic open systems at ultra-low temperatures.},
doi = {10.1063/1.5142164},
journal = {Journal of Chemical Physics},
number = 20,
volume = 152,
place = {United States},
year = {Wed May 27 00:00:00 EDT 2020},
month = {Wed May 27 00:00:00 EDT 2020}
}

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