Kirstein Erik, Yakovlev Dmitri R, Zhukov Evgeny A, Kopteva Nataliia E, Turedi Bekir, Kovalenko Maksym V, Bayer Manfred
Technische Universität Dortmund, Experimentelle Physik 2, 44227, Dortmund, Germany.
Department of Chemistry and Applied Biosciences, Laboratory of Inorganic Chemistry, ETH Zürich, Zürich, 8093, Switzerland.
Adv Sci (Weinh). 2025 Jul;12(27):e2502735. doi: 10.1002/advs.202502735. Epub 2025 May 7.
Quantum technologic and spintronic applications require reliable semiconducting materials that enable a significant, long-living spin polarization of electronic excitations and offer the ability to manipulate it optically in an external field. Due to the specifics of band structure and remarkable spin-dependent properties, the lead halide perovskite semiconductors are suitable candidates for that. Here, the carrier spin dynamics in a MAPbI (MA = methylammonium) perovskite single crystal with thickness of 20 µm are studied by the time-resolved Kerr ellipticity technique at cryogenic temperatures. Long times of longitudinal electron spin relaxation T = 30 ns and transverse electron spin dephasing ns are found. The spin dynamics lasting longer than the applied laser pulse repetition period give rise to spin accumulation effects. They are exploited through the resonant spin amplification, polarization recovery, and spin inertia techniques to study the electron and hole spin systems coupled with the nuclear spins. These results establish the lead halide perovskite semiconductors as suitable platform for quantum technologies relying on spin-dependent phenomena.
量子技术和自旋电子学应用需要可靠的半导体材料，这些材料能够实现电子激发的显著且持久的自旋极化，并具备在外部场中对其进行光学操控的能力。由于能带结构的特殊性以及显著的自旋相关特性，卤化铅钙钛矿半导体是合适的候选材料。在此，通过低温下的时间分辨克尔椭圆率技术研究了厚度为20微米的MAPbI（MA = 甲铵）钙钛矿单晶中的载流子自旋动力学。发现纵向电子自旋弛豫时间T = 30纳秒，横向电子自旋去相位时间为纳秒。自旋动力学持续时间长于施加的激光脉冲重复周期会产生自旋积累效应。通过共振自旋放大、极化恢复和自旋惯性技术来利用这些效应，以研究与核自旋耦合的电子和空穴自旋系统。这些结果确立了卤化铅钙钛矿半导体作为依赖自旋相关现象的量子技术的合适平台。
