Spontaneous loop-spin current with topological characters in the Hubbard model
Strongly Correlated Electrons
2014-08-06 v2
Abstract
We find a state characterized by a spontaneous loop-spin current and a single-particle gap in the Hubbard model within the variational cluster approach. This state exists for arbitrarily small interaction in a half-filled honeycomb lattice. Moreover, from the calculations of the topological invariants for the interacting system, it is shown that this gapped state has nontrivial topological characters; this state is the topological Mott insulating state. This result implies the ubiquity of topological Mott insulating phases.
Cite
@article{arxiv.1405.3808,
title = {Spontaneous loop-spin current with topological characters in the Hubbard model},
author = {Shimpei Goto and Keisuke Masuda and Susumu Kurihara},
journal= {arXiv preprint arXiv:1405.3808},
year = {2014}
}
Comments
8 pages, 9 figures