Self‐Assembled Quantum Dot Structures in a Hexagonal Nanowire for Quantum Photonics

Abstract

Two types of quantum nanostructures based on self-assembled GaAs quantumdots embedded into GaAs/AlGaAs hexagonal nanowire systems are reported, opening a new avenue to the fabrication of highly efficient single-photon sources, as well as the design of novel quantum optics experiments and robust quantum optoelectronic devices operating at higher temperature, which are required for practical quantum photonics applications.

High-efficiency broadband second harmonic generation in single hexagonal GaAs nanowire

“…Figure 1(c) shows a typical scanning electron microscope (SEM) image of a single GaAs NW with a diameter of approximately 500 nm and a length of approximately 5.55  μ m. The inset in Fig. 1(c) shows that the NW has a hexagonal cross-section as previously reported 35 .…”

Self-catalyzed molecular beam epitaxy growth and their optoelectronic properties of vertical GaAs nanowires on Si(111)

“…As a technologically important III-V semiconductor, nanowires of GaAs are promising candidates for applications in single-photon sources [5], light emitting diodes [6,7], lasers [8,9], photodetectors [10,11], field effect transistors [12] and solar cells [13] due to the direct bandgap and high electron mobility. Of these application fields, photodetectors based on the GaAs NWs with a metal-semiconductormetal (MSM) configuration have been the focus of considerable attention in recent years [14][15][16].…”

Multiple radial phosphorus segregations in GaAsP core-shell nanowires

“…Different types of such nanowire features have been reported, including unintentional core-shell structures [3,4], radial elemental segregations [5][6][7][8][9][10][11][12], alloy fluctuations [13,14], longitudinal wires that form along the vertical edges [15][16][17] and pyramidical elemental segregations [18,19]. Most of these exhibit optical properties consistent with self-formed passivation layers [3] or quantum structures such as quantum dots [13,18,19], wires [15,16], and rings [20,21]. While some of these could be detrimental by giving rise to unintentional emission or acting as carrier traps, others such as the pyramidical elemental segregations have been reported to show superior optical properties, far exceeding that of those that are intentionally grown [18,19].…”

“…While some of these could be detrimental by giving rise to unintentional emission or acting as carrier traps, others such as the pyramidical elemental segregations have been reported to show superior optical properties, far exceeding that of those that are intentionally grown [18,19]. On the other hand, self-assembly has long been used as a means of assembling structures in the nanoscale with a level of precision and ease that may not otherwise have been possible, and same has been true in relation to nanowires [16,18,19,22].…”