Prerequisites for relevant spectral density and convergence of reduced density matrices at low temperatures
Chemical Physics
2020-05-22 v1 Quantum Physics
Abstract
Hierarchical equations of motion approach with the Drude-Lorentz spectral density has been widely employed in investigating quantum dissipative phenomena. However, it is often computationally costly for low-temperature systems because a number of Matsubara frequencies are involved. In this note, we examine a prerequisite required for spectral density, and demonstrate that relevant spectral density may significantly reduce the number of Matsubara terms to obtain convergent results for low temperatures.
Keywords
Cite
@article{arxiv.1911.12735,
title = {Prerequisites for relevant spectral density and convergence of reduced density matrices at low temperatures},
author = {Akihito Ishizaki},
journal= {arXiv preprint arXiv:1911.12735},
year = {2020}
}
Comments
7 pages, 1 figure, 2 tables; J. Phys. Soc. Jpn. 89, xxxxxx (2020)