Two-site entanglement in the two-dimensional Hubbard model
Strongly Correlated Electrons
2026-01-28 v2
Abstract
The study of entanglement in strongly correlated electron systems typically requires knowledge of the reduced density matrix. Here, we apply the parquet dynamical vertex approximation to study the two-site reduced density matrix at varying distance, in the Hubbard model at weak coupling. This allows us to investigate the spatial structure of entanglement in dependence of interaction strength, electron filling, and temperature. We compare results from different entanglement measures, and benchmark against quantum Monte Carlo.
Cite
@article{arxiv.2506.09780,
title = {Two-site entanglement in the two-dimensional Hubbard model},
author = {Frederic Bippus and Anna Kauch and Gergő Roósz and Christian Mayrhofer and Fakher Assaad and Karsten Held},
journal= {arXiv preprint arXiv:2506.09780},
year = {2026}
}
Comments
21 pages, 12 figures