NDLI: Self-assembly of single “square” quantum rings in gold-free GaAs nanowires

Content Provider	Royal Society of Chemistry (RSC)
Author	Wang, Li Sun, Baoquan Niu, Zhichuan Wang, Lijuan Shang, Xiangjun Zha, Guowei Xu, Jianxing Li, Mifeng Yu, Ying Ji, Yuan Su, Dan Wei, Bin Ni, Haiqiao
Copyright Year	2014
Abstract	Single nanostructures embedded within nanowires (NWs) represent one of the most promising technologies for applications in quantum photonics. However, fabrication imperfections and etching-induced defects are inevitable for top-down fabrications, whereas self-assembly bottom-up approaches cannot avoid the difficulties of its stochastic nature and are limited to restricted heterogeneous material systems. Here we demonstrate the versatile self-assembly of single “square” quantum rings (QR) on the sidewalls of gold-free GaAs NWs for the first time. By tuning the deposition temperature, As overpressure and amount of gallium-droplets, we were able to control the density and morphology of the structure, yielding novel single quantum dots, QR, coupled QRs, and nano-antidots. A proposed model based on a strain-driven, transport-dependent nucleation of gallium droplets at high temperature accounts for the formation mechanism of these structures. We achieved a single-QR-in-NW structure, of which the optical properties were analyzed using micro-photoluminescence at 10 K and a spatially resolved cathodoluminescence technique at 77 K. The spectra show sharp discrete peaks; of these peaks, the narrowest linewidth (separation) was 578 μeV (1–3 meV), reflecting the quantized nature of the ring-type electronic states.
Starting Page	3190
Ending Page	3196
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	6
Issue Number	6
Journal	Nanoscale
DOI	10.1039/c3nr05634a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Quantum Self-assembly Nucleation Gallium arsenide Spectral line Stochastic Sidewalls Cathodoluminescence Gallium nitride Photonics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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