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arXiv · 2007.13939

Pair emission from a relativistic domain wall in antiferromagnets

Gen Tatara·Collins Ashu Akosa·Rubén M. Otxoa de Zuazola
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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.

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Gen Tatara, Collins Ashu Akosa, Rubén M. Otxoa de Zuazola. 2020-07-28. Pair emission from a relativistic domain wall in antiferromagnets. https://doi.org/10.1103/physrevresearch.2.043226

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