Stochastic simulation of anharmonic dissipation. II. Harmonic bath potentials with quadratic couplings

The Journal of Chemical Physics
Yun-An Yan

Abstract

The workhorse simulating the dissipative dynamics is mainly based on the harmonic bath potentials together with linear system-bath couplings, but a realistic bath always assumes anharmonicity. In this work, we extend the linear dissipation model to include quadratic couplings and suggest a stochastic simulation scheme for the anharmonic dissipation. We show that the non-Gaussian noises induced by the anharmonic bath can be rigorously constructed, and the resulting stochastic Liouville equation has the same form as that for the linear dissipation model. As a preliminary application, we use this stochastic method to investigate the vibration-induced symmetry breaking in two-level electronic systems and find that the characteristic function of the non-Gaussian noises determines the absorption and fluorescence spectra.

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Citations

Jun 4, 2020·The Journal of Chemical Physics·Arif UllahVladimir Chernyak
May 1, 2021·The Journal of Physical Chemistry. B·Maxim F GelinLipeng Chen

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