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arXiv 2103.11317cond-mat.mes-hall
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螺旋形磁体的电磁响应与突现电感

Electromagnetic response in spiral magnets and emergent inductance

Daichi Kurebayashi, Naoto Nagaosa

摘要:

磁体中的突现电磁现象起源于传导电子自旋与非共线有序矩自旋之间的强耦合以及由此产生的Berry相。这为开发量子输运和光学响应的新功能提供了可能性。螺旋磁体中的突现电感是最近提出并通过实验证明的一个例子,它利用交变电流感应的突现电场。然而,这种现象的微观理论是缺失的,它应该揭示决定电感L的大小、符号、频率依赖性和非线性的因素。在这里,我们从理论上研究的电磁响应的螺旋磁铁考虑到他们的集体模式。与共线自旋密度波形成鲜明对比的是,即使在一维情况下,该系统仍保持金属性,均匀磁化强度和相子坐标的正则共轭关系起着至关重要的作用,决定了L.这一结果为设计具有所需特性的涌现电感开辟了一条道路。

英文摘要:

Emergent electromagnetism in magnets originates from the strong coupling between conduction electron spins and those of noncollinear ordered moments and the consequent Berry phase. This offers possibilities to develop new functions of quantum transport and optical responses. The emergent inductance in spiral magnets is an example recently proposed and experimentally demonstrated, used the emergent electric field induced by alternating currents. However, the microscopic theory of this phenomenon is missing, which should reveal the factors to determine the magnitude, sign, frequency dependence, and nonlinearity of the inductance L. Here we theoretically study electromagnetic responses of spiral magnets taking into account their collective modes. In sharp contrast to the collinear spin-density wave, the system remains metallic even in one-dimension, and the canonical conjugate relation of uniform magnetization and phason coordinate plays an essential role, determining the properties of L. This result opens a way to design the emergent inductance of desired properties.

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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