Pair emission from a relativistic domain wall in antiferromagnets
Mesoscale and Nanoscale Physics
2020-11-16 v1
Abstract
Magnon emission and excitation by a relativistic domain wall at a constant velocity in antiferromagnet is theoretically studied. A pair emission due to a quadratic magnon coupling is shown to be dominant. The emission corresponds in the comoving frame to a vacuum polarization induced by a zero-energy instability of the Lorentz-boosted anomalous response function. The emission rate is sensitive to the magnon dispersion and wall profile, and is significantly enhanced for a thin wall with velocity close to the effective light velocity. The Ohmic damping constant due to magnon excitation at low velocity is calculated.
Keywords
Cite
@article{arxiv.2007.13939,
title = {Pair emission from a relativistic domain wall in antiferromagnets},
author = {Gen Tatara and Collins Ashu Akosa and Rubén M. Otxoa de Zuazola},
journal= {arXiv preprint arXiv:2007.13939},
year = {2020}
}