Blue-to-green single photons from InGaN/GaN dot-in-a-wire nanowire ordered arrays

TL;DR

This paper demonstrates the creation of ordered arrays of InGaN/GaN nanowire quantum dots that emit single photons in the blue-green spectrum, advancing practical quantum information applications.

Contribution

It reports the first observation of single-photon emission from InGaN/GaN nanowire arrays with high temperature operation potential.

Findings

Single-photon emission observed in blue-green spectral range.

Deep anti-bunching minima confirm single-photon nature.

Potential for GHz operation at high temperatures.

Abstract

Single-photon emitters (SPEs) are at the basis of many applications for quantum information management. Semiconductor-based SPEs are best suited for practical implementations because of high design flexibility, scalability and integration potential in practical devices. Single-photon emission from ordered arrays of InGaN nano-disks embedded in GaN nanowires is reported. Intense and narrow optical emission lines from quantum dot-like recombination centers are observed in the blue-green spectral range. Characterization by electron microscopy, cathodoluminescence and micro-photoluminescence indicate that single photons are emitted from regions of high In concentration in the nano-disks due to alloy composition fluctuations. Single-photon emission is determined by photon correlation measurements showing deep anti-bunching minima in the second-order correlation function. The present results are a promising step towards the realization of on-site/on-demand single-photon sources in the blue-green spectral range operating in the GHz frequency range at high temperatures.