Magnon dynamics in a Skyrmion-textured domain wall of antiferromagnets
Magnon dynamics in a Skyrmion-textured domain wall of antiferromagnets
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DOI：
10.1103/physrevb.107.184432
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Seungho Lee;Kouki Nakata;O. Tchernyshyov;Se Kwon Kim
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文献类型：
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作者：
Seungho Lee;Kouki Nakata;O. Tchernyshyov;Se Kwon Kim
我们从理论上研究了二维反铁磁体中磁振子与斯格明子纹理畴壁之间的相互作用，并阐明了磁振子输运的最终特性。利用超对称量子力学，我们解决了磁畴壁顶部磁振子的散射问题，并获得了传播磁振子模式和束缚磁振子模式的精确解。然后，我们在斯格明子织构的畴壁中发现了它们的反射和折射特性，其中磁振子由于其非平凡的自旋织构引起的有效规范场而经历了涌现的磁场。根据获得的磁振子和畴壁的散射特性，我们发现热传输随着畴壁手性的增加而减少。我们的结果表明，反铁磁体的热传输可以通过调节畴壁的斯格明子电荷密度来调节，这可能有助于实现电可调自旋热电子器件。
We theoretically investigate the interaction between magnons and a Skyrmion-textured domain wall in a two-dimensional antiferromagnet and elucidate the resultant properties of magnon transport. Using supersymmetric quantum mechanics, we solve the scattering problem of magnons on top of the domain wall and obtain the exact solutions of propagating and bound magnon modes. Then, we find their properties of reflection and refraction in the Skyrmion-textured domain wall, where magnons experience an emergent magnetic field due to its non-trivial spin texture-induced effective gauge field. Based on the obtained scattering properties of magnons and the domain wall, we show that the thermal transport decreases as the domain wall’s chirality increases. Our results suggest that the thermal transport of an antiferromagnet is tunable by modulating the Skyrmion charge density of the domain wall, which might be useful for realizing electrically tunable spin caloritronic devices.