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• W2983994104 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." @default.
• W2983994104 created "2019-11-22" @default.
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• W2983994104 date "2019-11-06" @default.
• W2983994104 modified "2023-10-12" @default.
• W2983994104 title "Quantifying non-Markovianity in underdamped versus overdamped environments and its effect on spectral lineshape" @default.
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• W2983994104 doi "https://doi.org/10.1063/1.5119300" @default.
• W2983994104 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31703500" @default.
• W2983994104 hasPublicationYear "2019" @default.
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