Kirstein Erik, Zhukov Evgeny A, Yakovlev Dmitri R, Kopteva Nataliia E, Harkort Carolin, Kudlacik Dennis, Hordiichuk Oleh, Kovalenko Maksym V, Bayer Manfred
Experimental Physics 2, Department of Physics, TU Dortmund, 44227 Dortmund, Germany.
Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia.
Nano Lett. 2023 Jan 11;23(1):205-212. doi: 10.1021/acs.nanolett.2c03975. Epub 2022 Dec 27.
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.
具有出色光学特性的Ruddlesden-Popper钙钛矿融合了卤化铅钙钛矿和二维材料的多种潜在特性。在此，通过在外部磁场中进行皮秒泵浦-探测克尔旋转，研究了Ruddlesden-Popper（PEA）PbI钙钛矿中的相干自旋动力学。确定了自旋退相时间为190 ps的驻留电子的拉莫尔自旋进动。通过自旋惯性方法测量的弱磁场中的纵向自旋弛豫时间长达25 μs。发现电子g因子存在显著各向异性，面内值为+2.45，面外值为+2.05。通过磁反射率测量出激子面外g因子为+1.6。这项工作有助于理解二维钙钛矿的自旋相关特性及其自旋动力学。
