Axion instability and non-linear electromagnetic effect
Mesoscale and Nanoscale Physics
2019-01-30 v1
Abstract
We investigate the instability due to dynamical axion field near the topological phase transition of insulators. We first point out that the amplitude of dynamical axion field is bounded for magnetic insulators in general, which suppresses the axion instability. Near the topological phase transition, however, the axion field may have a large fluctuation, which decreases the critical electric field for the instability and increases the axion induced magnetic flux density. Using two different model Hamiltonians, we report the electromagnetic response of the axion field in details.
Cite
@article{arxiv.1808.10466,
title = {Axion instability and non-linear electromagnetic effect},
author = {Tatsushi Imaeda and Yuki Kawaguchi and Yukio Tanaka and Masatoshi Sato},
journal= {arXiv preprint arXiv:1808.10466},
year = {2019}
}
Comments
12 pages, 9 figures