物理学报Issue(12)：1-8,8.DOI:10.7498/aps.63.127202
CdTe量子点的室温激子自旋弛豫动力学
Exciton spin relaxation dynamics in CdTe quantum dots at ro om temp erature
摘要
Abstract
Size-dependent exciton spin relaxation dynamics in CdTe colloidal quantum dots is studied at room temperature with the cross-polarized heterodyne third-order nonlinear transient grating technique The CdTe exciton spin relaxation reveals a mono-exponential decay behavior with a time constant of 0.1-0.5 ps when the pump-probe photon energy is tuned to be in resonance with the lowest exciton absorption transition (1Se-1Sh). The exciton spin relaxation in quantum dot is mainly governed by the hole spin flip process and ascribed to the transitions between bright-dark exciton fine structure states, i.e. J =±1←→∓2. This finding suggests that the exciton spin relaxation rate in CdTe quantum dot is inversely proportional to the fourth power of quantum dot size.关键词
激子自旋弛豫/CdTe量子点/瞬态光栅技术Key words
exciton spin relaxation/CdTe quantum dots/transient grating technique引用本文复制引用
朱孟龙,董玉兰,钟海政,何军..CdTe量子点的室温激子自旋弛豫动力学[J].物理学报,2014,(12):1-8,8.基金项目
国家自然科学基金(批准号:61222406,11174371)、湖南省自然科学基金(批准号:12JJ1001)、高等学校博士学科点专项科研基金(批准号:20110162120072)、教育部新世纪优秀人才支持计划(批准号：NCET-11-0512)和中央高校基本科研业务费资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.61222406,11174371), the Natural Science Foundation of Hunan Province, China (Grant No.12JJ1001), the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.20110162120072), the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-11-0512), and the Fundamental Research Fund for the Central Universities, China （批准号:61222406,11174371）
