title: Single photons on-demand from light-hole excitons in strain-engineered quantum dots.
abstract: 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].
authors.affiliation: Institute for Integrative Nanosciences, IFW Dresden , Helmholtzstraße 20, 01069, Dresden, Germany.
authors.forename: Jiaxiang
authors.initials: J
authors.lastname: Zhang
authors.forename: Yongheng
authors.initials: Y
authors.lastname: Huo
authors.forename: Armando
authors.initials: A
authors.lastname: Rastelli
authors.forename: Michael
authors.initials: M
authors.lastname: Zopf
authors.forename: Bianca
authors.initials: B
authors.lastname: Höfer
authors.forename: Yan
authors.initials: Y
authors.lastname: Chen
authors.forename: Fei
authors.initials: F
authors.lastname: Ding
authors.forename: Oliver G
authors.initials: OG
authors.lastname: Schmidt
keywords: Light-hole; PMN-PT; coherence time; nanomembrane; quantum dot; single-photon source