Magnon pair emission from a relativistic domain wall in antiferromagnets

Gen Tatara, Collins Ashu Akosa, Ruben M. Otxoa De Zuazola

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Magnon emission and excitation by a relativistic domain wall at a constant velocity in antiferromagnets 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.

Original languageEnglish
Article number043226
JournalPhysical Review Research
Volume2
Issue number4
DOIs
Publication statusPublished - 2020 Nov 12
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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