Spin interactions in magnetically-doped double perovskites addressed by Raman and Brillouin light scattering

自旋翻转拉曼散射（SFRS）光谱是一种强大的光学技术，其基于在激光线附近（从0.1 meV开始）具有高光谱分辨率的信号的共振激发和检测。SFRS可以直接测量塞曼效应引起的微小能量分裂，并可以计算固体体系中磁性杂质的载流子、激子和局域自旋的Landé因子以及不同络合物之间的交换相互作用强度。SFRS信号的强度、偏振和光谱分布提供了关于光学跃迁的选择规则、所述电子态的自旋结构的丰富信息，包括它们的波函数的对称性和它们在强磁场中的修改。在这个项目的框架内，我们将使用SFRS技术，布里渊散射光谱和偏振光致发光光谱的进步，研究新兴材料中的自旋相关现象-无铅双钙钛矿，包括大块单晶和胶体纳米晶体。主要重点将放在磁性钙钛矿材料上，其中电子，空穴和磁性离子之间的交换相互作用可用于在自旋电子和光子器件中建立新的功能。

Spin-flip Raman scattering (SFRS) spectroscopy is a powerful optical technique based on the resonant excitation and detection of signals with high spectral resolution in close vicinity of the laser line (starting from 0.1 meV). SFRS allows one to measure directly tiny energy splittings induced by Zeeman effect and to evaluate the Landé factors of charge carriers, excitons and localized spins of magnetic impurities in solid state systems and the strength of exchange interactions between different complexes. Intensity, polarization and spectral profile of SFRS signals deliver rich information about the selection rules for optical transitions, spin structure of the addressed electronic states, including symmetries of their wave functions and their modifications in strong magnetic fields. In the framework of this project we will use advances of the SFRS technique, Brillouin spectroscopy and polarized photoluminescence spectroscopy for investigating spin-dependent phenomena in emerging materials - lead-free double perovskites including bulk single crystals and colloidal nanocrystals. The main focus will be set on magnetic perovskite materials, where exchange interaction between electrons, holes and magnetic ions can be used to establish new functionalities in spintronic and photonic devices.