Comment on "Symmetry properties of magnetization in the Hubbard model at finite temperature"

TL;DR

This paper reexamines previous results on symmetry properties in the Hubbard model, clarifying that certain exact relations hold at all temperatures and correcting inaccuracies in earlier correlation function solutions.

Contribution

It corrects and clarifies the validity of symmetry relations in the Hubbard model across all temperatures, addressing errors in prior solutions.

Findings

Exact relations valid down to zero temperature

Previous correlation function solutions are incorrect

Clarifies symmetry properties in the Hubbard model

Abstract

The results of G. Su and M. Suzuki [Phys. Rev. B 54, 8291 (1996); ibidem 57, 13367 (1998)] for the spin and pseudo-spin symmetry properties of the Hubbard model are reexamined. We point out that the exact relations they have found are valid down to zero temperature and that their solutions for both spin and pseudo-spin correlation functions are incorrect.