摘要
A very long lifetime exciton emission with non-single exponential decay characteristics has been reported for single InA-s/GaAs quantum dot(QD)samples,in which there exists a long-lived metastable state in the wetting layer(WL)through radiative field coupling between the exciton emissions in the WL and the dipole field of metal islands.In this article we have proposed a new three-level model to simulate the exciton emission decay curve.In this model,assuming that the excitons in a metastable state will diffuse and be trapped by QDs,and then emit fluorescence in QDs,a stretchedlike exponential decay formula is derived as I(t)=At^(β−1)e^(−(rt)^(β)),which can describe well the long lifetime decay curve with an analytical expression of average lifetime(τ)=1/rГ(1/β+1),where G is the Gamma function.Furthermore,based on the proposed three-level model,an expression of the second-order auto-correlation function g^(2)(t)which can fit the measured g^(2)(t)curve well,is also obtained.
作者
黄君辉
陈昊
卓志瑶
王健
李叔伦
丁琨
倪海桥
牛智川
江德生
窦秀明
孙宝权
Junhui Huang;Hao Chen;Zhiyao Zhuo;Jian Wang;Shulun Li;Kun Ding;Haiqiao Ni;Zhichuan Niu;Desheng Jiang;Xiuming Dou;Baoquan Sun(State Key Laboratory of Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;College of Materials Science and Optoelectronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Beijing Academy of Quantum Information Sciences,Beijing 100193,China)
基金
Project supported by the National Key Research and Development Program of China(Grant No.2016YFA0301202)
the National Natural Science Foundation of China(Grant Nos.61827823 and 11974342).