Meliakov Sergey R, Zhukov Evgeny A, Belykh Vasilii V, Nestoklon Mikhail O, Kolobkova Elena V, Kuznetsova Maria S, Bayer Manfred, Yakovlev Dmitri R
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991 Moscow, Russia.
Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany.
Nanoscale. 2024 Nov 28;16(46):21496-21505. doi: 10.1039/d4nr03132f.
The coherent spin dynamics of electrons and holes in CsPbI 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 to 120 K. The Landé -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 a temperature of 6 K, allowing us to study the corresponding energy dependence of the -factors. The electron -factor decreases with increasing confinement energy in the NCs as a result of NC size reduction, and also with increasing temperature. The hole -factor shows the opposite trend. Model analysis shows that the variation of -factors with NC size arises from the transition energy dependence of the -factors, which becomes strongly renormalized by temperature.
通过时间分辨法拉第椭圆率技术，在高达430 mT的磁场中，跨越6 K至120 K的温度范围，研究了玻璃基质中CsPbI钙钛矿纳米晶体中电子和空穴的相干自旋动力学。根据观察到的电子和空穴自旋的拉莫尔进动来评估朗德因子和自旋退相时间。三个研究样品中的纳米晶体尺寸在约8至16 nm之间变化，导致在6 K温度下激子跃迁从1.69 eV变化到1.78 eV，这使我们能够研究相应的因子的能量依赖性。由于纳米晶体尺寸减小以及温度升高，电子因子随着纳米晶体中受限能量的增加而降低。空穴因子则呈现相反的趋势。模型分析表明，因子随纳米晶体尺寸的变化源于因子的跃迁能量依赖性，而这种依赖性会因温度而强烈重整化。
