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Quasi-one-dimensional density of states in a single quantum ring
- Source :
- Scientific Reports, Scientific Reports, Nature Publishing Group, 2017, 7, pp.40026. ⟨10.1038/srep40026⟩, SCIENTIFIC REPORTS(7)
- Publication Year :
- 2017
- Publisher :
- HAL CCSD, 2017.
-
Abstract
- Generally confinement size is considered to determine the dimensionality of nanostructures. While the exciton Bohr radius is used as a criterion to define either weak or strong confinement in optical experiments, the binding energy of confined excitons is difficult to measure experimentally. One alternative is to use the temperature dependence of the radiative recombination time, which has been employed previously in quantum wells and quantum wires. A one-dimensional loop structure is often assumed to model quantum rings, but this approximation ceases to be valid when the rim width becomes comparable to the ring radius. We have evaluated the density of states in a single quantum ring by measuring the temperature dependence of the radiative recombination of excitons, where the photoluminescence decay time as a function of temperature was calibrated by using the low temperature integrated intensity and linewidth. We conclude that the quasi-continuous finely-spaced levels arising from the rotation energy give rise to a quasi-one-dimensional density of states, as long as the confined exciton is allowed to rotate around the opening of the anisotropic ring structure, which has a finite rim width.
- Subjects :
- Physics
Multidisciplinary
Photoluminescence
Exciton
02 engineering and technology
Radius
021001 nanoscience & nanotechnology
01 natural sciences
Article
0103 physical sciences
Density of states
Spontaneous emission
Atomic physics
[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat]
010306 general physics
0210 nano-technology
Quantum
Quantum well
Bohr radius
ComputingMilieux_MISCELLANEOUS
Subjects
Details
- Language :
- English
- ISSN :
- 20452322
- Database :
- OpenAIRE
- Journal :
- Scientific Reports, Scientific Reports, Nature Publishing Group, 2017, 7, pp.40026. ⟨10.1038/srep40026⟩, SCIENTIFIC REPORTS(7)
- Accession number :
- edsair.doi.dedup.....cb2adfbe540d00c568b0b85124e95bd1