An effective field theory of magneto-elasticity
An effective field theory of magneto-elasticity
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DOI：
10.21468/scipostphys.12.5.155
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发表时间：
2021-12
期刊：
影响因子：
5.5
通讯作者：
Shashin Pavaskar;R. Penco;I. Rothstein
中科院分区：
文献类型：
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作者：
Shashin Pavaskar;R. Penco;I. Rothstein
本文利用陪集结构导出了（反）铁磁和亚铁磁绝缘材料中磁振子-声子相互作用的有效场论。该行动是用来计算的运动方程，概括的朗道-Lifshitz和应力方程，以允许磁声耦合到所有订单的领域中的最低阶的导数扩展。我们还包括对称性破缺效应由于塞曼，和Dzyaloshinsky-Moriya相互作用。这个有效的理论是从第一原理研究磁弹性现象的工具箱。作为一个例子，我们用这个理论计算了由于它衰变成声子而对磁振子衰变宽度的首阶贡献。
We utilize the coset construction to derive the effective field theory of magnon-phonon interactions in (anti)-ferromagnetic and ferrimagnetic insulating materials. The action is used to calculate the equations of motion which generalize the Landau-Lifshitz and stress equations to allow for magneto-acoustic couplings to all orders in the fields at lowest order in the derivative expansion. We also include the symmetry breaking effects due to Zeeman, and Dzyaloshinsky-Moriya interactions. This effective theory is a toolbox for the study of magneto-elastic phenomena from first principles. As an example we use this theory to calculate the leading order contribution to the magnon decay width due to its the decay into phonons.