On the memory kernel and the reduced system propagator

Lyran Kidon, Haobin Wang, Michael Thoss, Eran Rabani

Research output: Contribution to journalArticlepeer-review

Abstract

We relate the memory kernel in the Nakajima-Zwanzig-Mori time-convolution approach to the reduced system propagator which is often used to obtain the kernel in the Tokuyama-Mori time-convolutionless approach. The connection provides a robust and simple formalism to compute the memory kernel for a generalized system-bath model circumventing the need to compute high order system-bath observables, thus streamlining the use of numerically exact solvers for calculating the memory kernel. We illustrate this for a model system with electron-electron and electron-phonon couplings, driven away from equilibrium.

Original languageEnglish
Article number104105
JournalJournal of Chemical Physics
Volume149
Issue number10
DOIs
StatePublished - 14 Sep 2018

Funding

FundersFunder number
Office of Basic Energy Sciences
National Science Foundation
U.S. Department of Energy
Office of Science
Division of Materials Sciences and Engineering
Deutsche Forschungsgemeinschaft
National Science FoundationCHE-1500285

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