Outer zone morphology in GaAs ring/disk nanostructures by droplet epitaxy
✍ Scribed by C. Somaschini; S. Bietti; A. Fedorov; N. Koguchi; S. Sanguinetti
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 305 KB
- Volume
- 323
- Category
- Article
- ISSN
- 0022-0248
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✦ Synopsis
We present the molecular beam epitaxy (MBE) fabrication of GaAs ring/disk nanostructures. In this system, a central quantum ring is surrounded by a flat outer disk-like region, which is developed following a layer-by-layer growth mode. We studied the influence of the growth temperature on the morphology of these nanostructures and found out a pronounced dependence only for the outer region diameter, which is interpreted in terms of larger Ga atoms surface diffusion length at higher temperatures. Our experimental data provide a fundamental parameter to control the final shape of GaAs coupled ring/disk nanostructures.