SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: Spin phenomena in semiconductors

HL 15.3: Vortrag

Dienstag, 28. März 2023, 10:00–10:15, POT 251

Spin-flip Raman scattering on resident electrons and holes in two-dimensional (PEA)2PbI4 perovskites — •Carolin Harkort¹, Dennis Kudlacik¹, Natalia E. Kopteva¹, Dmitri R. Yakovlev¹, Marek Karzel¹, Erik Kirstein¹, Oleh Hordiichuk^2,3, Maksym V. Kovalenko^2,3, and Manfred Bayer¹ — ¹Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund — ²Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland — ³Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland

Two-dimensional lead halide perovskites are promising material systems for photovoltaic and optoelectronic applications. They are attractive for optical control of carrier spins due to an increased chemical stability compared to bulk lead halide perovskites. With the technique of Spin-flip Raman scattering we investigated in 2D Ruddlesden-Popper type (PEA)₂PbI₄ perovskites the Zeeman splitting of carrier spins, resident electrons and holes, that can be detected through the exciton emission. The Landé-factors of these electrons and holes and their anisotropy are measured at a low temperature of 2 K. We show that the hole Zeeman splitting is affected by the Overhauser field resulting from the dynamic nuclear polarization which allows us to define the sign of the hole Landé-factor. In this structure the Overhauser field has a maximum value of 600 mT.