title: Ultrafast, Polarized, Single-Photon Emission from m-Plane InGaN Quantum Dots on GaN Nanowires.
abstract: We demonstrate single-photon emission from self-assembled m-plane InGaN quantum dots (QDs) embedded on the side-walls of GaN nanowires. A combination of electron microscopy, cathodoluminescence, time-resolved microphotoluminescence (μPL), and photon autocorrelation experiments give a thorough evaluation of the QD structural and optical properties. The QD exhibits antibunched emission up to 100 K, with a measured autocorrelation function of g(2)(0) = 0.28(0.03) at 5 K. Studies on a statistically significant number of QDs show that these m-plane QDs exhibit very fast radiative lifetimes (260 ± 55 ps) suggesting smaller internal fields than any of the previously reported c-plane and a-plane QDs. Moreover, the observed single photons are almost completely linearly polarized aligned perpendicular to the crystallographic c-axis with a degree of linear polarization of 0.84 ± 0.12. Such InGaN QDs incorporated in a nanowire system meet many of the requirements for implementation into quantum information systems and could potentially open the door to wholly new device concepts.
authors.affiliation: Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, U.K.
authors.forename: Tim J
authors.initials: TJ
authors.lastname: Puchtler
authors.affiliation: Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, U.K.
authors.forename: Tong
authors.initials: T
authors.lastname: Wang
authors.affiliation: Dept. Materials Science and Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge CB3 0FS, U.K.
authors.forename: Christopher X
authors.initials: CX
authors.lastname: Ren
authors.affiliation: Dept. Materials Science and Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge CB3 0FS, U.K.
authors.forename: Fengzai
authors.initials: F
authors.lastname: Tang
authors.affiliation: Dept. Materials Science and Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge CB3 0FS, U.K.
authors.forename: Rachel A
authors.initials: RA
authors.lastname: Oliver
authors.affiliation: Department of Physics, University of Oxford , Parks Road, Oxford OX1 3PU, U.K.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Taylor
authors.affiliation: Dept. Materials Science and Metallurgy, University of Cambridge , 27 Charles Babbage Road, Cambridge CB3 0FS, U.K.
authors.forename: Tongtong
authors.initials: T
authors.lastname: Zhu
keywords: InGaN; m-Plane; polarized; quantum dot; single photon