Axionic Antiferromagnetic Insulator Phase in a Correlated and Spin-Orbit Coupled System
Strongly Correlated Electrons
2014-09-25 v3 Mesoscale and Nanoscale Physics
Materials Science
High Energy Physics - Phenomenology
Abstract
We study theoretically a three-dimensional correlated and spin-orbit coupled system, the half-filled extended Fu-Kane-Mele-Hubbard model on a diamond lattice, focusing on the topological magnetoelectric response of the antiferromagnetic insulator phase. In the antiferromagnetic insulator phase, the Dirac-like low-energy effective Hamiltonian is obtained. Then the theta term, which results in the magnetoelectric response, is derived as a consequence of the chiral anomaly. The realization of the dynamical axion field in our model is discussed. The relation with a symmetry broken phase induced by interactions in lattice quantum chromodynamics is also discussed.
Cite
@article{arxiv.1401.4523,
title = {Axionic Antiferromagnetic Insulator Phase in a Correlated and Spin-Orbit Coupled System},
author = {Akihiko Sekine and Kentaro Nomura},
journal= {arXiv preprint arXiv:1401.4523},
year = {2014}
}
Comments
7 pages, 2 figures