Note: On the memory kernel and the reduced system propagator
Other Condensed Matter
2018-09-14 v1 Mesoscale and Nanoscale Physics
Statistical Mechanics
Quantum Physics
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. We illustrate this for a model system with electron-electron and electron-phonon couplings, driven away from equilibrium.
Cite
@article{arxiv.1807.07206,
title = {Note: On the memory kernel and the reduced system propagator},
author = {Lyran Kidon and Haobin Wang and Michael Thoss and Eran Rabani},
journal= {arXiv preprint arXiv:1807.07206},
year = {2018}
}