Green, D, Humphries, BS, Dijkstra, AG orcid.org/0000-0003-2298-4736 et al. (1 more author) (2019) Quantifying non-Markovianity in underdamped versus overdamped environments and its effect on spectral lineshape. Journal of Chemical Physics, 151 (17). 174112. ISSN 0021-9606
Abstract
Non-Markovian effects in open quantum systems are central to understanding spectral lineshape. Here, we quantify the non-Markovianity associated with both overdamped and underdamped vibrations in terms of information flow between the bath and the system and compare this with the broadening and ellipticity of two-dimensional spectra. Using the Breuer Laine Piilo (BLP) measure, we link the well-known stochastic models for spectral lineshape with modern quantum information theory. Specifically, we study the effect of non-Markovianity in a system in contact with underdamped vibrations and examine the differences observed on increasing the damping to the overdamped limit. The open quantum system dynamics are evolved using the hierarchical equations of motion, efficiently terminated with a Markovian cutoff, where separate hierarchies are derived for the underdamped and overdamped environments. It is shown that the BLP measure is quantitatively correlated with the ellipticity of two-dimensional spectra and memory effects are more pronounced in underdamped environments, due to the long-lived feedback of information between the system and its bath, compared to overdamped environments. Environmental signatures in spectral lineshapes emerge as a result of information flow from the bath back into the system.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Green, D, Humphries, B, Dijkstra, A et al. (1 more author) (Accepted: 2019) Quantifying non-Markovianity in underdamped versus overdamped environments and its effect on spectral lineshape. . Journal of Chemical Physics. ISSN 0021-9606. Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Physical Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 23 Oct 2019 13:20 |
Last Modified: | 06 Dec 2019 13:35 |
Status: | Published |
Publisher: | American Institute of Physics |
Identification Number: | 10.1063/1.5119300 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:152318 |