Indirect communication between non-Markovian baths

Humphries, Ben S., Green, Dale and Jones, Garth A. (2025) Indirect communication between non-Markovian baths. Journal of Chemical Physics, 163 (20). ISSN 0021-9606

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Abstract

In this work, we show that information transfer occurs between two baths, even in the absence of a direct coupling between the baths. This bath–system–bath-mediated information transfer leads to intricate non-Markovian dynamics in the open system considered. We show this through the development of a model for an undamped vibration in the presence of an overdamped bath. This two-bath model involves a new derivation of the hierarchical equations of motion (HEOM) for an overdamped Lorentz–Drude (LD) environment, which is combined with an undamped oscillator (UO) bath, termed LDUO-HEOM. The model is analyzed using expectation values of the bath coordinates, which demonstrates an approach to understanding dissipation and relaxation between multiple, coupled baths. The model generates 2D electronic spectra that are in qualitative agreement with single-bath models while eliminating additional superfluous damping, which was introduced by the finite spectral width of the underdamped bath in our previous two-bath underdamped–overdamped, “bath vibration model” [Humphries et al., J. Chem. Phys. 156, 084103 (2022)].

Item Type:	Article
Additional Information:	Data Availability The data that support the findings of this contribution are available from the corresponding authors upon reasonable request.
Uncontrolled Keywords:	non-markovian,heom,undamped spectral density,overdamped spectral density,2d spectroscopy,lorentz-drude
Faculty \ School:	Faculty of Science > School of Engineering, Mathematics and Physics Faculty of Science > School of Chemistry, Pharmacy and Pharmacology
UEA Research Groups:	Faculty of Science > Research Groups > Quantum Matter Faculty of Science > Research Groups > Fluids & Structures Faculty of Science > Research Groups > Centre for Photonics and Quantum Science (former - to 2025) Faculty of Science > Research Groups > Chemistry of Light and Energy (former - to 2025)
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	11 Dec 2025 11:30
Last Modified:	15 Dec 2025 18:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/101365
DOI:	10.1063/5.0253804

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