Minimal pole representation for spectral functions
Strongly Correlated Electrons
2025-06-04 v2 Mesoscale and Nanoscale Physics
Abstract
Representing spectral densities, real-frequency, and real-time Green's functions of continuous systems by a small discrete set of complex poles is an ubiquitous problem in condensed matter physics, with applications ranging from quantum transport simulations to the simulation of strongly correlated electron systems. This paper introduces a method for obtaining a compact, approximate representation of these functions, based on their parameterization on the real axis and a given approximate precision. We show applications to typical spectral functions and results for structured and unstructured correlation functions of model systems.
Cite
@article{arxiv.2504.01163,
title = {Minimal pole representation for spectral functions},
author = {Lei Zhang and André Erpenbeck and Yang Yu and Emanuel Gull},
journal= {arXiv preprint arXiv:2504.01163},
year = {2025}
}