Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 30: Poster 2

HL 30.32: Poster

Thursday, September 8, 2022, 11:00–13:00, P3

Spin Polarization Dynamics of Photo-excited Carriers in CsPbX3 Nanocrystals — •Ahmet Tosun, Simone Strohmair, Anja Barfüßer, Quinten Akkerman, Tushar Debnath, Amrita Dey, and Jochen Feldmann — Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig-Maximilians-Universität (LMU), Königinstr. 10, 80539 Munich, Germany

We present results on spin relaxation dynamics of photoexcited carriers in CsPbX3 nanocrystals by employing time-resolved differential transmission spectroscopy. After photoexcitation with circularly polarized light we observe a pronounced spin polarization in CsPbI3 nanocrystals. This spin-polarization is caused by selectively exciting spin-allowed transitions and is lost during thermalization and cooling of the photoexcited charge carriers. From temperature-dependent experiments we conclude that carrier-spin relaxation in CsPbI3 nanocrystals is predominantly caused by carrier-LO phonon scattering and can be described by the Elliot-Yafet mechanism.