The influence of a Hamiltonian vibration vs a bath vibration on the 2D electronic spectra of a homodimer

We elucidate the influence of the system–bath boundary placement within an open quantum system, with emphasis on the two-dimensional electronic spectra, through the application of the hierarchical equations of motion formalism for an exciton system. We apply two different models, the Hamiltonian vib...

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Veröffentlicht in:The Journal of chemical physics 2022-02, Vol.156 (8), p.084103-084103
Hauptverfasser: Humphries, Ben S., Green, Dale, Jones, Garth A.
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creator Humphries, Ben S.
Green, Dale
Jones, Garth A.
description We elucidate the influence of the system–bath boundary placement within an open quantum system, with emphasis on the two-dimensional electronic spectra, through the application of the hierarchical equations of motion formalism for an exciton system. We apply two different models, the Hamiltonian vibration model (HVM) and bath vibration model (BVM), to a monomer and a homodimer. In the HVM, we specifically include the vibronic states in the Hamiltonian capturing vibronic quenching, whereas in the BVM, all vibrational details are contained within the bath and described by an underdamped spectral density. The resultant spectra are analyzed in terms of energetic peak position and thermodynamic broadening precision in order to evaluate the efficacy of the two models. The HVM produces 2D spectra with accurate peak positional information, while the BVM is well suited to modeling dynamic peak broadening. For the monomer, both models produce equivalent spectra in the limit where additional damping associated with the underdamped vibration in the BVM approaches zero. This is supported by analytical results. However, for the homodimer, the BVM spectra are redshifted with respect to the HVM due to an absence of vibronic quenching in the BVM. The computational efficiency of the two models is also discussed in order to inform us of the most appropriate use of each method.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Damping
Electronic spectra
Equations of motion
Excitons
Monomers
Physics
Quantum theory
Quenching
Two dimensional models
Vibration
title The influence of a Hamiltonian vibration vs a bath vibration on the 2D electronic spectra of a homodimer
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