Temperature dependence of the electron and hole Land\'e g-factors in CsPbI3 nanocrystals in a glass matrix

Sergey R. Meliakov; Evgeny A. Zhukov; Vasilii V. Belykh; Mikhail O. Nestoklon; Elena V. Kolobkova; Maria S. Kuznetsova; Manfred Bayer; Dmitri R. Yakovlev

arXiv · 2407.21610

Temperature dependence of the electron and hole Land\'e g-factors in CsPbI3 nanocrystals in a glass matrix

Sergey R. Meliakov·Evgeny A. Zhukov·Vasilii V. Belykh·Mikhail O. Nestoklon·Elena V. Kolobkova·Maria S. Kuznetsova·Manfred Bayer·Dmitri R. Yakovlev

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Abstract

The coherent spin dynamics of electrons and holes in CsPbI3 perovskite nanocrystals in a glass matrix are studied by the time-resolved Faraday ellipticity technique in magnetic fields up to 430 mT across a temperature range from 6 K up to 120 K. The Land\'e g-factors and spin dephasing times are evaluated from the observed Larmor precession of electron and hole spins. The nanocrystal size in the three studied samples varies from about 8 to 16 nm, resulting in exciton transition varying from 1.69 to 1.78 eV at the temperature of 6 K, allowing us to study the corresponding energy dependence of the g-factors. The electron g-factor decreases with increasing confinement energy in the NCs as result of NC size reduction, and also with increasing temperature. The hole g-factor shows the opposite trend. A model analysis shows that the variation of g-factors with NC size arises from the transition energy dependence of the g-factors, which becomes strongly renormalized by temperature.

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Sergey R. Meliakov, Evgeny A. Zhukov, Vasilii V. Belykh, Mikhail O. Nestoklon, Elena V. Kolobkova, Maria S. Kuznetsova, Manfred Bayer, Dmitri R. Yakovlev. 2024-07-31. Temperature dependence of the electron and hole Land\'e g-factors in CsPbI3 nanocrystals in a glass matrix. https://arxiv.org/abs/2407.21610

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