Wan Yi, Cheng Xing, Li Yanfang, Wang Yaqian, Du Yongping, Zhao Yibin, Peng Bo, Dai Lun, Kan Erjun
Department of Applied Physics and Institution of Energy and Microstructure, Nanjing University of Science and Technology Nanjing 210094 China
State Key Laboratory for Artificial Microstructure & Mesoscopic Physics, School of Physics, Peking University Beijing 100871 China
RSC Adv. 2021 Jan 20;11(7):4035-4041. doi: 10.1039/d0ra09350e. eCollection 2021 Jan 19.
Magneto-optical effects, which originate from the interactions between light and magnetism, have provided an important way to characterize magnetic materials and hosted abundant applications, such as light modulators, magnetic field sensors, and high-density data storage. However, such effects are too weak to be detected in non-magnetic materials due to the absence of spin degree of freedom. Here, we demonstrated that applying a perpendicular magnetic field can produce a colossal Raman scattering rotation in non-magnetic MoS, for A-mode representing the out-of-plane breathing vibration. Our experimental results show that linearly polarized scattering light is rotated by ∓125°, more apparent than the valley Zeeman splitting effect (∓1.2 meV) under the same experimental conditions (±5 T), near room temperature. A detailed and systematic analysis on the polarization-resolved magnetic field-dependent micro-zone Raman intensity offers a feasible way to manipulate the inelastically scattered light a magnetic technique. This explored phenomenology and physical mechanism arouse a new ramification of probing burgeoning magneto-optical effects in the field of two-dimensional laminar materials.
磁光效应源于光与磁之间的相互作用，为表征磁性材料提供了一种重要方法，并拥有丰富的应用，如光调制器、磁场传感器和高密度数据存储。然而，由于缺乏自旋自由度，这种效应在非磁性材料中太微弱而无法被检测到。在此，我们证明了施加垂直磁场可以在非磁性的二硫化钼（MoS₂）中产生巨大的拉曼散射旋转，对于代表面外呼吸振动的A模式而言。我们的实验结果表明，在接近室温的相同实验条件（±5 T）下，线偏振散射光旋转了∓125°，比谷塞曼分裂效应（∓1.2 meV）更明显。对偏振分辨的磁场依赖微区拉曼强度进行详细而系统的分析，为操纵非弹性散射光提供了一种可行的方法——一种磁性技术。这种探索的现象学和物理机制引发了二维层状材料领域中探测新兴磁光效应的一个新分支。
