Coherent Spin Dynamics of Electrons in Two-Dimensional (PEA) 2 PbI 4 Perovskites

The versatile potential of lead halide perovskites and two-dimensional materials is merged in the Ruddlesden-Popper perovskites having outstanding optical properties. Here, the coherent spin dynamics in Ruddlesden-Popper (PEA) PbI perovskites is investigated by picosecond pump-probe Kerr rotation in...

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Published in:Nano letters 2023-01, Vol.23 (1), p.205-212
Main Authors: Kirstein, Erik, Zhukov, Evgeny A, Yakovlev, Dmitri R, Kopteva, Nataliia E, Harkort, Carolin, Kudlacik, Dennis, Hordiichuk, Oleh, Kovalenko, Maksym V, Bayer, Manfred
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Language:English
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Summary:The versatile potential of lead halide perovskites and two-dimensional materials is merged in the Ruddlesden-Popper perovskites having outstanding optical properties. Here, the coherent spin dynamics in Ruddlesden-Popper (PEA) PbI perovskites is investigated by picosecond pump-probe Kerr rotation in an external magnetic field. The Larmor spin precession of resident electrons with a spin dephasing time of 190 ps is identified. The longitudinal spin relaxation time in weak magnetic fields measured by the spin inertia method is as long as 25 μs. A significant anisotropy of the electron -factor with the in-plane value of +2.45 and out-of-plane value of +2.05 is found. The exciton out-of-plane -factor of +1.6 is measured by magneto-reflectivity. This work contributes to the understanding of the spin-dependent properties of two-dimensional perovskites and their spin dynamics.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.2c03975