Coherent Spin Dynamics of Electrons in Two-Dimensional (PEA)<sub>2</sub>PbI<sub>4</sub> Perovskites.
basic_science · Level V
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- Record sourced from PubMed, PMID 36574606.
- Also identified by DOI 10.1021/acs.nanolett.2c03975.
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Abstract
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)<sub>2</sub>PbI<sub>4</sub> 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 <i>g</i>-factor with the in-plane value of +2.45 and out-of-plane value of +2.05 is found. The exciton out-of-plane <i>g</i>-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.