Spin coherence of electrons and holes in perovskite crystals and nanocrystals

Dmitri Yakovlev^a

^aExperimental Physics 2, TU Dortmund University, D-44221 Dortmund, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Spring 2024 Conference (MATSUS24)

#PeroQuant24 - Halide perovskites for quantum technologies

Barcelona, Spain, 2024 March 4th - 8th

Organizers: Simon Boehme, Sascha Feldmann and Maksym Kovalenko

Invited Speaker, Dmitri Yakovlev, presentation 057
DOI: https://doi.org/10.29363/nanoge.matsus.2024.057
Publication date: 18th December 2023

We provide a survey of our experimental studies of coherent spin dynamics of electrons and holes in lead halide perovskite crystals, nanocrystals and 2D materials. Time-resolved Faraday/Kerr rotation is used as technique in combination with magnetic fields up to 10 T and cryogenic temperatures. We measure spin relaxation and spin dephasing times, evaluate electron and hole Lande g-factors, demonstrate the hyperfine interaction of carrier spins with nuclear spin system. In perovskite nanocrystals grown both by colloidal chemistry and synthesized in glass matrix the electron spin coherence is detected even at room temperature and unusual temperature dependence of the electron g-factor is found. We establish experimentally and approve theoretically universal dependences of the electron, hole and exciton Lande g-factors on the bandgap energy, which in nanocrystals are further modified by carrier confinement. 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:

[1] V. V. Belykh, et al., Coherent spin dynamics of electrons and holes in CsPbBr3 perovskite crystals, Nature Communications 10, 673 (2019).

[2] P. S. Grigoryev, et al., Coherent spin dynamics of electrons and holes in CsPbBr3 colloidal nanocrystals, Nano Letters 21, 8481 (2021).

[3] E. Kirstein, et al., Lead-dominated hyperfine interaction impacting the carrier spin dynamics in halide perovskites, Advanced Materials 34, 2105263 (2022).

[4] E. Kirstein, et al., Spin dynamics of electrons and holes interacting with nuclei in MAPbI3 perovskite single crystals, ACS Photonics 9, 1375 (2022).

[5] E. Kirstein, et al., Mode locking of hole spin coherences in CsPb(Cl,Br)3 perovskite nanocrystals, Nature Communications 14, 699 (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)

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