arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.09514cond-mat.mtrl-sci
收藏

磁体光伏效应对$EuSn_2As_2$磁结构的探测

Magnetic bulk photovoltaic effect as a probe of magnetic structures of $EuSn_2As_2$

Hanqi Pi, Shuai Zhang, Hongming Weng

摘要:

体光伏效应(BPVE)是非中心对称材料中的一种二阶光学过程,它将光转换为直流电流。BPVE根据产生机制分为移位电流和注入电流,其对光的偏振依赖性对材料的空间和时间反转对称性敏感。本文通过对称性分析和第一性原理计算,对不同磁结构的$EuSn_2As_2$的BPVE响应进行了全面的研究。我们证明了偶数层的层间反铁磁(AFM)$EuSn_2As_2$打破了反转对称性,具有二阶光学响应。此外,双层AFM $EuSn_2As_2$不仅在磁矩沿不同方向排列时显示出不同的BPVE响应,而且在具有相互垂直的面内磁矩的两相中显示出与磁相关的响应。由于BPVE响应依赖于光的偏振和磁对称性,这些磁结构可以通过圆偏振光与精心设计的实验区分。我们的工作证明了BPVE响应作为探测磁结构的工具的可行性。

英文摘要:

The bulk photovoltaic effect (BPVE) is a second-order optical process in noncentrosymmetric materials that converts the light into DC currents. BPVE is classified into shift current and injection current according to the generation mechanisms, whose dependence on the polarization of light is sensitive to the spatial and time-reversal symmetry of materials. In this work, we present a comprehensive study on the BPVE response of $EuSn_2As_2$ with different magnetic structures through symmetry analysis and first-principles calculation. We demonstrate that the interlayer antiferromagnetic (AFM) $EuSn_2As_2$ of even-layer breaks the inversion symmetry and has the second-order optical responses. Moreover, the bilayer AFM $EuSn_2As_2$ not only displays distinct BPVE responses when magnetic moments align in different directions, but also shows symmetry-related responses in two phases which have mutually perpendicular in-plane magnetic moments. Due to the dependence of BPVE responses on the polarization of light and magnetic symmetry, these magnetic structures can be distinguished by the circular polarized light with well-designed experiments. Our work demonstrates the feasibility of the BPVE response as a tool to probe the magnetic structure.

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。

↑