Back to Search
Start Over
Self-formation of hexagonal nanotemplates for growth of pyramidal quantum dots by metalorganic vapor phase epitaxy on patterned substrates
- Source :
- Nano Research
- Publisher :
- Tsinghua Univ Press
-
Abstract
- We demonstrate the self-formation of hexagonal nanotemplates on GaAs (111)B substrates patterned with arrays of inverted tetrahedral pyramids during metal-organic vapor phase epitaxy and its role in producing high-symmetry, site-controlled quantum dots (QDs). By combining atomic force microscopy measurements on progressively thicker GaAs epitaxial layers with kinetic Monte Carlo growth simulations, we demonstrate self-maintained symmetry elevation of the QD formation sites from three-fold to six-fold symmetry. This symmetry elevation stems from adatom fluxes directed towards the high-curvature sites of the template, resulting in the formation of a fully three-dimensional hexagonal template after the deposition of relatively thin GaAs layers. We identified the growth conditions for consistently achieving a hexagonal pyramid bottom, which are useful for producing high-symmetry QDs for efficient generation of entangled photons.
- Subjects :
- hexagonal nanotemplates
Materials science
Nanotemplates
Nanotechnology
02 engineering and technology
Epitaxy
01 natural sciences
Condensed Matter::Materials Science
symmetry elevation
Physics
0103 physical sciences
General Materials Science
Kinetic Monte Carlo
Electrical and Electronic Engineering
010306 general physics
kinetic Monte Carlo simulations
Deposition (law)
business.industry
Hexagonal pyramid
metalorganic vapor phase epitaxy
021001 nanoscience & nanotechnology
Condensed Matter Physics
Atomic and Molecular Physics, and Optics
Symmetry (physics)
epitaxial growth on patterned substrates
Quantum dot
Tetrahedron
adatom diffusion
Optoelectronics
0210 nano-technology
business
Science, technology and society
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Nano Research
- Accession number :
- edsair.doi.dedup.....21c3986e3b39e1eabac85481980b2baa