Although recent advances in simulating open quantum systems have led to significant progress, the applicability of numerically exact methods is still restricted to rather small systems. Hence, more approximate methods remain relevant due to their computational efficiency, enabling simulations of larger systems over extended timescales. In this study, we present advances for one such method, namely, the numerical integration of Schrödinger equation (NISE). First, we introduce a modified ensemble-averaging procedure that improves the long-time behavior of the thermalized variant of the NISE scheme, termed thermalized NISE. Second, we demonstrate how to use the NISE in conjunction with (highly) structured spectral densities by utilizing a noise generating algorithm for arbitrary structured noise. This algorithm also serves as a tool for establishing best practices in determining spectral densities from excited state calculations along molecular dynamics or quantum mechanics/molecular mechanics trajectories. Finally, we assess the ability of the NISE approach to calculate absorption spectra and demonstrate the utility of the proposed modifications by determining population dynamics.
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7 October 2024
Research Article|
October 01 2024
Spectral densities, structured noise and ensemble averaging within open quantum dynamics
Special Collection:
Algorithms and Software for Open Quantum System Dynamics
Yannick Marcel Holtkamp
;
Yannick Marcel Holtkamp
(Conceptualization, Investigation, Methodology, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
School of Science, Constructor University
, Campus Ring 1, 28759 Bremen, Germany
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Emiliano Godinez-Ramirez
;
Emiliano Godinez-Ramirez
a)
(Conceptualization, Investigation, Software, Validation)
School of Science, Constructor University
, Campus Ring 1, 28759 Bremen, Germany
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Ulrich Kleinekathöfer
Ulrich Kleinekathöfer
b)
(Conceptualization, Funding acquisition, Methodology, Supervision, Validation, Writing – original draft, Writing – review & editing)
School of Science, Constructor University
, Campus Ring 1, 28759 Bremen, Germany
b)Author to whom correspondence should be addressed: ukleinekathoefer@constructor.university
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b)Author to whom correspondence should be addressed: ukleinekathoefer@constructor.university
a)
Present address: Department of Physics, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Straße 1, 85748 Garching, Germany.
J. Chem. Phys. 161, 134101 (2024)
Article history
Received:
June 21 2024
Accepted:
September 15 2024
Citation
Yannick Marcel Holtkamp, Emiliano Godinez-Ramirez, Ulrich Kleinekathöfer; Spectral densities, structured noise and ensemble averaging within open quantum dynamics. J. Chem. Phys. 7 October 2024; 161 (13): 134101. https://doi.org/10.1063/5.0224807
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