Spin-Flip Raman Scattering on Electrons and Holes in Two-Dimensional (PEA)(2)PbI4 Perovskites

Autor: Carolin Harkort, Dennis Kudlacik, Natalia E. Kopteva, Dmitri R. Yakovlev, Marek Karzel, Erik Kirstein, Oleh Hordiichuk, Maksym V. Kovalenko, Manfred Bayer
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Small
ISSN: 1613-6810
1613-6829
DOI: 10.3929/ethz-b-000610925
Popis: The class of Ruddlesden-Popper type (PEA)(2)PbI4 perovskites comprises 2D structures whose optical properties are determined by excitons with a large binding energy of about 260 meV. It complements the family of other 2D semiconductor materials by having the band structure typical for lead halide perovskites, that can be considered as inverted compared to conventional III-V and II-VI semiconductors. Accordingly, novel spin phenomena can be expected for them. Spin-flip Raman scattering is used here to measure the Zeeman splitting of electrons and holes in a magnetic field up to 10 T. From the recorded data, the electron and hole Lande factors (g-factors) are evaluated, their signs are determined, and their anisotropies are measured. The electron g-factor value changes from +2.11 out-of-plane to +2.50 in-plane, while the hole g-factor ranges between -0.13 and -0.51. The spin flips of the resident carriers are arranged via their interaction with photogenerated excitons. Also the double spin-flip process, where a resident electron and a resident hole interact with the same exciton, is observed showing a cumulative Raman shift. Dynamic nuclear spin polarization induced by spin-polarized holes is detected in corresponding changes of the hole Zeeman splitting. An Overhauser field of the polarized nuclei acting on the holes as large as 0.6 T can be achieved.
Small
ISSN:1613-6810
ISSN:1613-6829
Databáze: OpenAIRE
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