Crystals
(Aug 2022)
Light Hole Excitons in Strain-Coupled Bilayer Quantum Dots with Small Fine-Structure Splitting
Xiangjun Shang,
Hanqing Liu,
Xiangbin Su,
Shulun Li,
Huiming Hao,
Deyan Dai,
Zesheng Chen,
Haiqiao Ni,
Zhichuan Niu
Affiliations
Xiangjun Shang
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Hanqing Liu
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Xiangbin Su
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Shulun Li
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Huiming Hao
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Deyan Dai
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Zesheng Chen
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Haiqiao Ni
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Zhichuan Niu
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
DOI
https://doi.org/10.3390/cryst12081116
Journal volume & issue
Vol. 12,
no. 8
Abstract
Read online
In this work, we measure polarization-resolved photoluminescence spectra from excitonic complexes in tens of single InAs/GaAs quantum dots (QDs) at the telecom O-band with strain-coupled bilayer structure. QDs often show fine-structure splitting (FSS) ~100 μeV in uniform anisotropy and valence-band mixing of heavy holes (HH) and light holes (LH); the biaxial strain also induces LH excitons with small FSS (especially XX, hh and enhances population on LH excitons XX, XX11, X11+ and XX21+.
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