稀土离子Ce3+掺杂晶体的电子自旋与原子核自旋动力学

电子自旋与原子核自旋有望应用于量子信息的存储与处理。实际应用需要足够长的自旋退相干时间，因此寻找具有长自旋退相干时间的材料体系至关重要。众多研究发现Ce:YAG晶体具有较长的电子自旋退相干时间。而Ce:YSO晶体中超精细相互作用更弱，理论上具有更长的电子自旋退相干时间。此外，相比于块体材料，纳米晶体由于更强的电子局域性、更少的原子核数以及存在表面效应，所以通常具有独特的、优越的自旋特性。本项目拟针对Ce:YSO块体单晶及纳米尺度的Ce:YAG和Ce:YSO材料，采用时间分辨法拉第旋转光谱和时间分辨发光技术进行电子自旋与原子核自旋动力学的研究，深入认识磁场强度、环境温度、光场条件以及表面效应等因素对电子自旋与原子核自旋动力学的影响，揭示自旋驰豫机制，实现自旋信号的高效调控。电子自旋和原子核自旋的深入研究有望为Ce3+掺杂晶体应用于量子信息的存储与处理提供重要指导。

The electron spin and nuclear spin are considered as promising candidates for quantum information storage and processing. Long-lived spin decoherence time is required in practical applications, so it is very important to find a material system with long-lived spin decoherence time. Many studies have found that Ce:YAG crystals have a long spin decoherence time. Since the hyperfine interaction in Ce:YSO crystal is weaker, theoretically it has longer electron spin decoherence time than Ce:YAG. Besides, nanocrystals generally have unique and superior spin properties due to their stronger electron localization, fewer nuclei, and more surface effects than bulk materials. In this project, we plan to study electron and nuclear spin dynamics in Ce: YSO bulk single crystals and Ce-doped nanocrystals by time-resolved Faraday rotation spectroscopy and time-resolved photoluminescence spectroscopy. The project intends to understand the influences of magnetic field strength, environmental temperatures, laser field conditions and surface effects on electron and nuclear spin dynamics, reveal spin relaxation mechanism and realize efficient manipulation of spins. The in-depth study of electron spin and nuclear spin dynamics is expected to provide an important guidance for the application of Ce3+-doped crystals in the storage and processing of quantum information.