Thermal coupled cluster theory for SU(2) systems
Abstract
Coupled cluster (CC) has established itself as a powerful theory to study correlated quantum many-body systems. Finite-temperature generalizations of CC theory have attracted considerable interest and have been shown to work as nicely as the ground-state theory. However, most of these recent developments address only fermionic or bosonic systems. The distinct structure of the algebra requires the development of a similar thermal CC theory for spin degrees of freedom. In this paper, we provide a formulation of our thermofield-inspired thermal CC for SU(2) systems. We apply the thermal CC to the Lipkin-Meshkov-Glick system as well as the one-dimensional transverse field Ising model as benchmark applications to highlight the accuracy of thermal CC in the study of finite-temperature phase diagrams in SU(2) systems.
Cite
@article{arxiv.2107.07922,
title = {Thermal coupled cluster theory for SU(2) systems},
author = {Gaurav Harsha and Yi Xu and Thomas M. Henderson and Gustavo E. Scuseria},
journal= {arXiv preprint arXiv:2107.07922},
year = {2022}
}
Comments
14 pages, 6 figures