Orbital Edelstein Effect as a Condensed-Matter Analog of Solenoids.
Orbital Edelstein Effect as a Condensed-Matter Analog of Solenoids.
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DOI：
10.1021/acs.nanolett.7b04300
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发表时间：
2017-06
期刊：
影响因子：
10.8
通讯作者：
Taiki Yoda;T. Yokoyama;S. Murakami
中科院分区：
文献类型：
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作者：
Taiki Yoda;T. Yokoyama;S. Murakami
本文从理论上研究了手征晶体中的电流诱导轨道磁化。这种现象是轨道版的埃德尔斯坦效应。我们提出了一个类比之间的电流诱导的轨道磁化和经典电动力学中的螺线管的安培场。为了量化这种影响，我们定义了一个无量纲参数的响应系数与轨道磁化电流密度。这个无量纲的参数可以被看作是一个单位晶胞内的匝数，当晶体被视为螺线管，它代表了如何“手性”的晶体。通过关注无量纲参数，可以设计实现大轨道磁化感应的能带结构。特别地，具有接近费米能量的所有外尔节点的外尔半金属可以具有这个无量纲参数的大值，其可以超过经典螺线管的值。
We theoretically study current-induced orbital magnetization in a chiral crystal. This phenomenon is an orbital version of the Edelstein effect. We propose an analogy between the current-induced orbital magnetization and an Ampère field in a solenoid in classical electrodynamics. To quantify this effect, we define a dimensionless parameter from the response coefficients relating a current density with an orbital magnetization. This dimensionless parameter can be regarded as a number of turns within a unit cell when the crystal is regarded as a solenoid, and it represents how "chiral" the crystal is. By focusing on the dimensionless parameter, one can design a band structure that realizes the induction of large orbital magnetization. In particular, a Weyl semimetal with all of the Weyl nodes close to the Fermi energy can have a large value for this dimensionless parameter, which can exceed that of a classical solenoid.