Nonreciprocal responses from non-centrosymmetric quantum materials.
Nonreciprocal responses from non-centrosymmetric quantum materials.
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DOI：
10.1038/s41467-018-05759-4
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发表时间：
2018-09-14
影响因子：
16.6
通讯作者：
Nagaosa N
中科院分区：
文献类型：
--
作者：
Tokura Y;Nagaosa N
量子粒子和电流（如电子、光子、自旋和声子）的定向输运和传播已知发生在具有破缺反转对称性的材料系统中，例如半导体p-n结中的二极管和手性材料中的自然光学活性。这种非互易响应在非中心对称的量子材料中普遍存在，当时间反演对称性通过施加磁场或自发磁化而被进一步破坏时，例如磁手征效应和手征磁体中的非互易磁振子输运或自旋电流。在响应电流和电场平方的非线性区域中，甚至可以出现更多种类的非互易现象，包括拓扑起源的光电流和极性/手性半导体中的单向磁阻。微观上，量子材料中的这些非互易响应经常被量子Berry相位、环矩和磁电势编码，从而培育了功能拓扑材料的沃土。本文综述了非中心对称量子材料中非互易响应的基本机制、涌现现象和作用。在反转对称性破缺的材料中，可以发生多种定向的电子输运现象。在这里，Tokura和Nagaosa回顾了非中心对称量子材料中非互易响应的基本机制和涌现现象。
Directional transport and propagation of quantum particle and current, such as electron, photon, spin, and phonon, are known to occur in the materials system with broken inversion symmetry, as exemplified by the diode in semiconductor p–n junction and the natural optical activity in chiral materials. Such a nonreciprocal response in the quantum materials of noncentrosymmetry occurs ubiquitously when the time-reversal symmetry is further broken by applying a magnetic field or with spontaneous magnetization, such as the magnetochiral effect and the nonreciprocal magnon transport or spin current in chiral magnets. In the nonlinear regime responding to the square of current and electric field, even a more variety of nonreciprocal phenomena can show up, including the photocurrent of topological origin and the unidirectional magnetoresistance in polar/chiral semiconductors. Microscopically, these nonreciprocal responses in the quantum materials are frequently encoded by the quantum Berry phase, the toroidal moment, and the magnetoelectric monopole, thus cultivating the fertile ground of the functional topological materials. Here, we review the basic mechanisms and emergent phenomena and functions of the nonreciprocal responses in the noncentrosymmetric quantum materials. A variety of directional electronic transport phenomena can occur in materials with broken inversion-symmetry. Here, Tokura and Nagaosa review the underlying mechanisms and emergent phenomena of nonreciprocal responses in noncentrosymmetric quantum materials.
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