Effects of magnon-magnon interactions in a noncollinear magnet induced by combination of a symmetric and an antisymmetric exchange interaction

Effects of magnon-magnon interactions in a noncollinear magnet induced by combination of a symmetric and an antisymmetric exchange interaction
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由对称和反对称交换相互作用组合引起的非共线磁体中磁振子-磁振子相互作用的影响

DOI:
10.1103/physrevb.101.064411
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发表时间:
2020
期刊:
影响因子:
3.7
通讯作者:
Naoya Arakawa
Naoya Arakawa
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Okumura Shun;Ishizuka Hiroaki;Kato Yasuyuki;Ohe Jun-ichiro;Motome Yukitoshi;Naoya Arakawa

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我们研究了磁振子-磁振子相互作用及其在由反铁磁海森堡相互作用和 Dzyaloshinsky-Moriya 相互作用组合引起的螺旋磁体中的影响。我们表明,磁振子-磁振子相互作用对低能磁振子的主要影响是重新归一化能量色散系数。这可以解释为什么一些实验与非相互作用理论一致。我们还表明,尽管磁振子-磁振子相互作用引起低能磁振子的对振幅,但其对激发能的影响可以忽略不计。这表明对于磁振子来说,有限对振幅不一定伴随着对凝聚。
We study magnon-magnon interactions and their effects in a spiral magnet induced by combination of an antiferromagnetic Heisenberg interaction and a Dzyaloshinsky-Moriya interaction. We show that the main effect of magnon-magnon interactions on low-energy magnons is to renormalize the coefficient of energy dispersion. This could explain why some experiments are consistent with the noninteracting theory. We also show that although the magnon-magnon interactions induce the pair amplitude for low-energy magnons, its effect on the excitation energy is negligible. This suggests that for magnons the finite pair amplitude does not necessarily accompany the pair condensation.
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