Self-Induced Dark States in Two-Dimensional Excitons

Zhiyao Zhuo; Hao Chen; Junhui Huang; Shulun Li; Jian Wang; Kun Ding; Haiqiao Ni; Zhichuan Niu; Desheng Jiang; Xiuming Dou; Baoquan Sun

doi:10.1021/acs.jpclett.1c00633

Self-Induced Dark States in Two-Dimensional Excitons

J Phys Chem Lett. 2021 Apr 15;12(14):3485-3489. doi: 10.1021/acs.jpclett.1c00633. Epub 2021 Apr 1.

Authors

Zhiyao Zhuo^{1

2}, Hao Chen^{1

2}, Junhui Huang^{1

2}, Shulun Li^{1

2}, Jian Wang^{1

2}, Kun Ding¹, Haiqiao Ni^{1

2}, Zhichuan Niu^{1

2

3}, Desheng Jiang¹, Xiuming Dou^{1

2}, Baoquan Sun^{1

2

3}

Affiliations

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.

PMID: 33792330
DOI: 10.1021/acs.jpclett.1c00633

Abstract

We have obtained an ultralong lifetime exciton emission in InAs/GaAs single quantum dots (QDs) when the QD films are transferred onto the Si substrate covered by Ag nanoparticles. It is found that when the separation distance from the QD layer (also the wetting layer) to the Ag nanoparticles is around 19 nm, the QD emission lifetime changes from approximately 1 to 2000 ns. A classical dipole oscillator model is used to quantitatively calculate the spontaneous radiation decay rate of the excitons in the wetting layer (WL), and the simulated calculation result is in good agreement with the experimental one, revealing that the long lifetime exciton emission is due to the existence of the dark state in the WL. The self-induced dark state stems from the destructive interference between the exciton emission field and the induced dipole field of the Ag nanoparticles.