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

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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.