Spin dynamics of excitons, carriers and nuclei in metal halide perovskite nanostructures

• Applicant: Professor Dmitri Yakovlev, Ph.D.
• Subject Area: Experimental Condensed Matter Physics
• Term: since 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 527080192

The project goal is to study energy and spin structure of exciton complexes in low dimensional metal halide perovskites nanostructures (nanocrystals and 2D layers) and to clarify the role of quantum confinement on the spin-related parameters and on the spin-dependent phenomena. We plan technological and experimental studies being supported by collaboration with theorists. Synthesized samples will be all-inorganic and organic-inorganic lead halide perovskite nanocrystals of various sizes and chemical compositions, and 2D layered materials with thickness ranged from 1 to 5 monolayers. Also, 2D samples will be fabricated with Pb substituted by Sn for lead-free materials or doped with magnetic Mn-ions to prove the concepts of diluted magnetic semiconductors. For experimental studies optical techniques, involving low temperatures, high magnetic fields up to 60 T, polarization analysis, time-resolution in temporal range from 200 fs to seconds and high spectral resolution will be used. We will focus on spin-dependent phenomena and spin dynamics of interacting spin systems of carriers (electrons and holes), excitons (neutral and charged) and nuclei spins by measuring g-factors, spin relaxation and spin coherence times and identifying mechanisms of spin-spin interactions. In Mn-doped samples interaction with localized Mn-spins will be additionally involved, which typically results in giant magneto-optical effects. We will search for new physical phenomena and new regimes of the known phenomena provided by the unique properties of the perovskites. The gained knowledge will be used for optimizing technology, parameters of light-emitting devices and for testing the feasibility of the perovskite nanostructures for spintronics applications.

• DFG Programme: Research Grants
• International Connection: Switzerland
• Partner Organisation: Schweizerischer Nationalfonds (SNF)
• Cooperation Partner: Professor Maksym Kovalenko, Ph.D.