Tensor Network Path Integral Study of Dynamics in B850 LH2 Ring with Atomistically Derived Vibrations.

Autor:	Bose A; Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States., Walters PL; Department of Chemistry, University of California, Berkeley, California 94720, United States.; Miller Institute for Basic Research in Science, University of California Berkeley, Berkeley, California 94720, United States.
Jazyk:	angličtina
Zdroj:	Journal of chemical theory and computation [J Chem Theory Comput] 2022 Jul 12; Vol. 18 (7), pp. 4095-4108. Date of Electronic Publication: 2022 Jun 22.
DOI:	10.1021/acs.jctc.2c00163
Abstrakt:	The recently introduced multisite tensor network path integral (MS-TNPI) allows simulation of extended quantum systems coupled to dissipative media. We use MS-TNPI to simulate the exciton transport and the absorption spectrum of a B850 bacteriochlorophyll (BChl) ring. The MS-TNPI network is extended to account for the ring topology of the B850 system. Accurate molecular-dynamics-based description of the molecular vibrations and the protein scaffold is incorporated through the framework of Feynman-Vernon influence functional. To relate the present work with the excitonic picture, an exploration of the absorption spectrum is done by simulating it using approximate and topologically consistent transition dipole moment vectors. Comparison of these numerically exact MS-TNPI absorption spectra are shown with second-order cumulant approximations. The effect of temperature on both the exact and the approximate spectra is also explored.
Databáze:	MEDLINE
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