Photocurrent response in parity-time symmetric current-ordered states
Photocurrent response in parity-time symmetric current-ordered states
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DOI：
10.1103/physrevb.104.024416
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发表时间：
2021-07
影响因子：
3.7
通讯作者：
Hikaru Watanabe;Y. Yanase
中科院分区：
文献类型：
--
作者：
Hikaru Watanabe;Y. Yanase
光生整流电流的产生，即光电流现象，越来越受到人们的关注。虽然响应归因于晶体的非中心对称结构，但伴随着磁有序的宇称违反，即磁宇称违反，最近作为光电流发生器的平台而引起注意。在本文中，我们调查的光电流响应的电流有序相，实现没有自旋自由度的磁宇称违反，虽然以前的研究集中在宇称违反自旋结构。环电流顺序打破了反转对称性，同时保持奇偶时间反转对称性。以Sr_2IrO_4为模型，研究了电流有序态下的线偏振光和圆偏振光诱导的光电流响应。根据光电流产生的机制，每个光电流具有不同的散射率容限。预测的光电流响应与原型半导体中的光电流响应相当。我们提出了一个探针，以检测隐藏的有序相在Sr2IrO4的光电流响应。
There is growing interest in the photo-induced generation of rectified current, namely photocurrent phenomenon. While the response was attributed to noncentrosymmetric structures of crystals, the parity violation accompanied by the magnetic ordering, that is, magnetic parity violation, is recently attracting attention as a platform for a photocurrent generator. In this paper, we investigate the photocurrent response in the current-ordered phase, realizing the magnetic parity violation without the spin degree of freedom, although prior studies focused on the parity-violating spin structure. The loop-current order breaks the inversion symmetry while preserving the parity-time-reversal symmetry. With a model of Sr2IrO4, we demonstrate the linearly and circularly polarized lightinduced photocurrent responses in the current-ordered state. Each photocurrent has a distinct tolerance of the scattering rate according to the mechanism for the photocurrent creation. The predicted photocurrent response is comparable to that in prototypical semiconductors. We propose a probe to detect the hidden-ordered phase in Sr2IrO4 by the photocurrent response.