On the memory kernel and the reduced system propagator

Lyran Kidon, Haobin Wang, Michael Thoss, Eran Rabani

Research output: Contribution to journalArticlepeer-review


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
Issue number10
StatePublished - 14 Sep 2018


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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