Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.363
Publication date: 18th July 2023
We provide a survey of our experimental studies of spin phenomena involving electrons, holes and nuclei in lead halide perovskite nanocrystals [1-6] and 2D structures [7,8]. Several experimental techniques are used: polarized emission in strong magnetic fields, time-resolved Faraday/Kerr rotation and spin-flip Raman scattering. Perovskite nanocrystals for these studies are grown by colloidal chemistry and synthesized in glass matrix. We measure spin relaxation and spin coherence times, evaluate electron and hole Lande g-factors, analyze the effects of the quantum confinement and perovskite composition, which tune the band gap, on the g-factors and compare that with model predictions. Electron spin coherence is detected even at room temperature, and unusual temperature dependence of the electron g-factor is found. Combination of the pump-probe Faraday rotation with radiofrequency allow us to use this spin resonance technique for detecting spin relaxation times of hundreds microseconds. Spin mode locking effect based on spin synchronization under periodic laser excitation is found in nanocrystals in glass. Experimental approaches of spin physics give reach information about these materials.
References
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[2] P. S. Grigoryev, et al., Coherent spin dynamics of electrons and holes in CsPbBr3 colloidal nanocrystals, Nano Letters 21, 8481 (2021).
[3] V. V. Belykh, et al., Submillisecond spin relaxation in CsPb(Cl,Br)3 perovskite nanocrystals in a glass matrix, Nano Letters 22, 4583 (2022).
[4] E. Kirstein, et al., Mode locking of hole spin coherences in CsPb(Cl,Br)3 perovskite nanocrystals, Nature Communications 14, 699 (2023).
[5] M. O. Nestoklon, et al., Tailoring the electron and hole Lande factors in lead halide perovskite nanocrystals by quantum confinement and halide exchange, Nano Letters 23, 8218 (2023).
[6] S. R. Meliakov, et al., Coherent spin dynamics of electrons in CsPbBr3 perovskite nanocrystals at room temperature, Nanomaterials 13, 2454 (2023).
[7] E. Kirstein, et al., Coherent spin dynamics of electrons in two-dimensional (PEA)2PbI4 perovskites, Nano Letters 23, 205 (2023).
[8] C. Harkort, et al., Spin-flip Raman scattering on electrons and holes in two-dimensional (PEA)2PbI4 perovskites, Small 2300988 (2023).
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