Single Photons On-Demand from Light-Hole Excitons in Strain-Engineered Quantum Dots

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• 作者：Jiaxiang Zhang ; Yongheng Huo ; Armando Rastelli ; Michael Zopf ; Bianca H枚fer ; Yan Chen ; Fei Ding ; Oliver G. Schmidt
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：January 14, 2015
• 年：2015
• 卷：15
• 期：1
• 页码：422-427
• 全文大小：335K
• ISSN：1530-6992

文摘

We demonstrate for the first time on-demand and wavelength-tunable single-photon emission from light-hole (LH) excitons in strain engineered GaAs quantum dots (QDs). The LH photon emission from tensile-strained GaAs QDs is systematically investigated with polarization-resolved, power-dependent photoluminescence spectroscopy, and photon-correlation measurements. By integrating QD-containing nanomembranes onto a piezo-actuator and driving single QDs with picosecond laser pulses, we achieve triggered and wavelength-tunable LH single-photon emission. Fourier transform spectroscopy is also performed, from which the coherence time of the LH single-photon emission is studied. We envision that this new type of LH exciton-based single-photon source (SPS) can be applied to realize an all-semiconductor based quantum interface in distributed quantum networks [ Phys. Rev. Lett. 2008, 100, 096602].