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arXiv 2007.13939cond-mat.mes-hall
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反铁磁体中相对论畴壁的对辐射

Pair emission from a relativistic domain wall in antiferromagnets

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

摘要:

本文从理论上研究了相对论畴壁对反铁磁体中磁振子的等速激发和发射。一对发射由于二次磁振子耦合被证明是占主导地位的。发射对应于在共动框架的真空极化引起的零能量不稳定性的洛伦兹增强的异常响应函数。发射率对磁振子色散和壁面轮廓很敏感,当壁面速度接近有效光速时,发射率显著增强。计算了低速磁振子激发的欧姆阻尼常数。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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