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- W4320513548 abstract "We present the quantum dynamics of a spin coupling to a bath of independent spins via the dissipaton equation of motion (DEOM) approach. The bath, characterized by a continuous spectral density function, is composed of spins that are independent level systems described by the su(2) Lie algebra. This represents an extreme class of anharmonic environment. Based on the conclusion drawn by Suarez and Silbey [J. Chem. Phys. 95, 9115 (1991)] and Makri [J. Chem. Phys. 111, 6164 (1999)] that the spin bath can be mapped to a Gaussian environment under its linear response limit, we derive the fluctuation-dissipation theorem (FDT) of the spin bath from a microscopic perspective, and generalize the discussion to the case of arbitrary bath spin quantum number S. Next, the time-domain Prony fitting decomposition scheme is applied to the bare-bath time correlation function (TCF) given by FDT to generate the exponential decay basis (or pseudo modes) for DEOM construction. The accuracy and efficiency of this strategy has been justified by a variety of numerical results. We envision this work provides new insights to extend the hierarchical equations of motion (HEOM) and DEOM approach to certain types of anharmonic enviroments with arbitrary TCF or spectral density" @default.
- W4320513548 created "2023-02-14" @default.
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- W4320513548 date "2023-01-31" @default.
- W4320513548 modified "2023-09-29" @default.
- W4320513548 title "Spin relaxation dynamics with a continuous spin environment: the dissipaton equation of motion approach" @default.
- W4320513548 doi "https://doi.org/10.48550/arxiv.2302.00215" @default.
- W4320513548 hasPublicationYear "2023" @default.
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