The intermediate and spin-liquid phase of the half-filled honeycomb Hubbard model
Strongly Correlated Electrons
2015-06-18 v1
Abstract
We obtain the phase-diagram of the half-filled honeycomb Hubbard model with density matrix embedding theory, to address recent controversy at intermediate couplings. We use clusters from 2-12 sites and lattices at the thermodynamic limit. We identify a paramagnetic insulating state, with possible hexagonal cluster order, competitive with the antiferromagnetic phase at intermediate coupling. However, its stability is strongly cluster and lattice size dependent, explaining controver- sies in earlier work. Our results support the paramagnetic insulator as being a metastable, rather than a true, intermediate phase, in the thermodynamic limit.
Keywords
Cite
@article{arxiv.1402.5622,
title = {The intermediate and spin-liquid phase of the half-filled honeycomb Hubbard model},
author = {Qiaoni Chen and George H. Booth and Sandeep Sharma and Gerald Knizia and Garnet Kin-Lic Chan},
journal= {arXiv preprint arXiv:1402.5622},
year = {2015}
}