摘要
当直接半导体中存在强的自旋轨道耦合作用,且材料结构不具备中心反演对称性时, Rashba效应将会出现,从而使自旋简并的能带分裂为具有相反自旋态的两个子能带.这两个子能带会偏离布里渊区的对称中心位置,致使半导体呈现出间接带隙的特征.金属卤化物钙钛矿兼具强的自旋轨道耦合和结构中心反演不对称性,在Rashba效应研究中展现出巨大的潜力.本文围绕钙钛矿中Rashba效应的理论研究与实验证明,Rashba效应对载流子复合的影响以及目前Rashba效应研究中出现的争论,系统地进行回顾与梳理;针对钙钛矿中Rashba效应的研究现状,提出了几个目前亟待解决的问题,并展望了该领域未来的研究方向.
When there is a strong spin-orbit coupling in some direct semiconductor with an inversion-asymmetric structure,the Rashba effect will exist,splitting the spin-degenerated bands into two sub-bands with opposite spin states.These two sub-bands will deviate from the symmetry center of the Brillouin zone,making the semiconductor an indirect band gap semiconductor.Metal halide perovskites exhibit strong spin-orbit coupling and possess an inversion-asymmetric crystal structure,showing great potential in Rashba effect research.In this review,we systematically review the Rashba effects in perovskites,including the theoretical and experimental studies for demonstrating the Rashba effect in perovskites,the influence of Rashba effect on the carrier recombination,and the current debates concerning the Rashba effect in perovskites.Then,several problems that need to be solved urgently are proposed,they being 1)whether there exists the Rashba effect in the perovskite,2)whether the Rashba effect can exert a significant influence on carrier recombination,and 3)what the relationship between the Rashba effect and the perovskite stucture is.The prospects are also given for the future research including the study of the Rashba effect in perovskites by various spectral methods and the applications of the Rashba effect in optical-electronic-magnetic devices.
作者
魏应强
徐磊
彭其明
王建浦
Wei Ying-Qiang;Xu Lei;Peng Qi-Ming;Wang Jian-Pu(Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM),Nanjing Tech University (NanjingTech),Nanjing 211816,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第15期1-20,共20页
Acta Physica Sinica
基金
国家重点基础研究发展计划(批准号:2015CB932200)
国家重点研发计划政府间国际科技创新合作重点专项中国与欧盟合作项目(批准号:2016YFE0112000)
国家自然科学基金重大研究计划(批准号:91733302)
国家自然科学基金青年科学基金(批准号:11804156)
国家杰出青年科学基金(批准号:61725502)
南京工业大学引进人才科研启动专项经费(批准号:38274017104)资助的课题~~
