Back to Search
Start Over
Origin of energy dispersion inAlxGa1−xN/GaNnanowire quantum discs with low Al content
- Source :
- Physical Review B. 82
- Publication Year :
- 2010
- Publisher :
- American Physical Society (APS), 2010.
-
Abstract
- Individual GaN nanowires containing ${\text{Al}}_{x}{\text{Ga}}_{1\ensuremath{-}x}\text{N}/\text{GaN}$ quantum discs (QDiscs) with Al content $x\ensuremath{\le}16\mathrm{%}$ have been investigated by microphotoluminescence, transmission electron microscopy, and theoretical modeling. Single quantum discs show narrow emission lines with a linewidth as low as 3 meV at energies above the GaN band gap while the emission of nanowires containing multiple quantum discs shows multiple peaks with total spectral broadening that depends on the Al content in the barrier. As assessed by simulations of the quantum confinement based on a three-dimensional effective-mass model, the main factors influencing the spectral dispersion are: (i) strain relaxation in the QDiscs, strongly affected by the presence of a lateral AlGaN shell with a progressively changing thickness formed during the barrier growth; (ii) monolayer fluctuations in the QDisc thickness.
- Subjects :
- Physics
Condensed matter physics
Band gap
business.industry
Quantum wire
Relaxation (NMR)
Nanowire
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Electronic, Optical and Magnetic Materials
Condensed Matter::Materials Science
Semiconductor
Quantum dot
0103 physical sciences
Emission spectrum
010306 general physics
0210 nano-technology
business
Doppler broadening
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 82
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........650cae537e6949d0850258f03beae463