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

自旋翻转拉曼散射（SFRS）光谱学是一种强大的光学技术，基于共振激发和检测激光线附近（0.1 meV起）的高光谱分辨率信号。SFRS允许人们直接测量由塞曼效应引起的微小能量分裂，并评估固体体系中磁性杂质的载流子、激子和局域自旋的land<e:1>因子以及不同配合物之间交换相互作用的强度。SFRS信号的强度、极化和光谱分布提供了丰富的光跃迁选择规则、寻址电子态的自旋结构、波函数的对称性及其在强磁场中的变化等信息。在这个项目的框架内，我们将使用先进的SFRS技术，布里频光谱和偏振光致发光光谱来研究新兴材料中的自旋依赖现象-无铅双钙钛矿，包括体单晶和胶体纳米晶体。主要焦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.