中国物理B ›› 2021, Vol. 30 ›› Issue (9): 97805-097805.doi: 10.1088/1674-1056/ac0818

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Exciton emission dynamics in single InAs/GaAs quantum dots due to the existence of plasmon-field-induced metastable states in the wetting layer

Junhui Huang(黄君辉)1,2, Hao Chen(陈昊)1,2, Zhiyao Zhuo(卓志瑶)1,2, Jian Wang(王健)1,2, Shulun Li(李叔伦)1,2, Kun Ding(丁琨)1,2, Haiqiao Ni(倪海桥)1,2, Zhichuan Niu(牛智川)1,2,3, Desheng Jiang(江德生)1, Xiuming Dou(窦秀明)1,2,†, and Baoquan Sun(孙宝权)1,2,3,‡   

  1. 1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    2 College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Beijing Academy of Quantum Information Sciences, Beijing 100193, China
  • 收稿日期:2021-05-07 修回日期:2021-06-01 接受日期:2021-06-04 出版日期:2021-08-19 发布日期:2021-08-31
  • 通讯作者: Xiuming Dou, Baoquan Sun E-mail:xmdou04@semi.ac.cn;bqsun@semi.ac.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301202) and the National Natural Science Foundation of China (Grant Nos. 61827823 and 11974342).

Exciton emission dynamics in single InAs/GaAs quantum dots due to the existence of plasmon-field-induced metastable states in the wetting layer

Junhui Huang(黄君辉)1,2, Hao Chen(陈昊)1,2, Zhiyao Zhuo(卓志瑶)1,2, Jian Wang(王健)1,2, Shulun Li(李叔伦)1,2, Kun Ding(丁琨)1,2, Haiqiao Ni(倪海桥)1,2, Zhichuan Niu(牛智川)1,2,3, Desheng Jiang(江德生)1, Xiuming Dou(窦秀明)1,2,†, and Baoquan Sun(孙宝权)1,2,3,‡   

  1. 1 State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;
    2 College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Beijing Academy of Quantum Information Sciences, Beijing 100193, China
  • Received:2021-05-07 Revised:2021-06-01 Accepted:2021-06-04 Online:2021-08-19 Published:2021-08-31
  • Contact: Xiuming Dou, Baoquan Sun E-mail:xmdou04@semi.ac.cn;bqsun@semi.ac.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFA0301202) and the National Natural Science Foundation of China (Grant Nos. 61827823 and 11974342).

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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 stretched-like exponential decay formula is derived as $I\left( t \right)=A\, t^{\beta -1}{\rm e}^{-\left( rt \right)^{\beta }}$, which can describe well the long lifetime decay curve with an analytical expression of average lifetime $\langle\tau\rangle=\frac{1}{r}\mathrm{\Gamma } ( \frac{1}{\beta }+1 )$，where $\Gamma $ is the Gamma function. Furthermore, based on the proposed three-level model, an expression of the second-order auto-correlation function $g^{2}\left( t \right)$ which can fit the measured $g^{2}\left( t \right)$ curve well, is also obtained.

关键词: quantum dots, collective excitations, charge carriers, time resolved spectroscopy

Abstract: 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 stretched-like exponential decay formula is derived as $I\left( t \right)=A\, t^{\beta -1}{\rm e}^{-\left( rt \right)^{\beta }}$, which can describe well the long lifetime decay curve with an analytical expression of average lifetime $\langle\tau\rangle=\frac{1}{r}\mathrm{\Gamma } ( \frac{1}{\beta }+1 )$，where $\Gamma $ is the Gamma function. Furthermore, based on the proposed three-level model, an expression of the second-order auto-correlation function $g^{2}\left( t \right)$ which can fit the measured $g^{2}\left( t \right)$ curve well, is also obtained.

Key words: quantum dots, collective excitations, charge carriers, time resolved spectroscopy

中图分类号:  (Quantum dots)

  • 78.67.Hc
73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)) 73.50.Gr (Charge carriers: generation, recombination, lifetime, trapping, mean free paths) 78.47.D- (Time resolved spectroscopy (>1 psec))