在磁场下的拓材料中的外部非线性克尔旋转
Shuang Wu1, Zaiyao Fei2, Zeyuan Sun1
1State Key Laboratory of Surface Physics, Key Laboratory of Micro and Nano Photonic Structures (MOE), and Department of Physics, Fudan University, Shanghai 200433, China.
ACS nano
|September 28, 2023
概括
非线性磁光二生成 (SHG) 揭示了晶体对称性如何影响量子材料的拓性质. 不同的格子对称性导致磁场下的不同反应,有助于探测拓特征.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料科学 量子材料科学
- 非线性光学是非线性光学.
背景情况:
- 量子材料的拓性质与对称性,晶体结构和外部领域密切相关.
- 对称度敏感的非线性光学测量,特别是在磁场中,是检测这些属性的强大工具.
- 非磁性拓材料为研究拓,对称性和外部刺激之间的相互作用提供了一个独特的平台.
研究的目的:
- 在非磁性拓材料中研究非线性磁光二生成 (SHG).
- 分析水晶格子对称性对SHG中磁场诱导的非线性克尔旋转的影响.
- 阐明控制不同材料中观察到的多种磁性-SHG反应的基础物理.
主要方法:
- 进行了极化分辨率的非线性光学第二波生成 (SHG) 测量.
- 应用外部磁场来研究磁光效应.
- 研究的材料包括双层WTe2,单层WSe2和散装TaAs.
- 分析了法拉第旋转,以了解与晶体对称性的相互作用.
主要成果:
- 在磁场下的时间逆转对称材料中观察到SHG极化模式中的非线性Kerr旋转.
- 证明具有3倍旋转对称性的材料表现出最小的SHG极化旋转.
- 表明具有镜像或双重旋转对称性的材料显示出显著的SHG极化旋转和扭曲.
- 通过对磁场诱导和基于晶体结构的非线性光学张量的叠加来解释观察到的现象.
结论:
- 这项研究强调了磁铁-SHG技术的实用性,用于直接探测量子材料中非碎的拓性质.
- 晶体对称性在确定拓材料的磁光反应方面发挥着至关重要的作用.
- 尽量减少外部非线性克尔旋转对于准确的偏振解析磁光学研究至关重要.
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