Quasi-one-dimensional density of states in a single quantum ring

Title
Quasi-one-dimensional density of states in a single quantum ring
Authors
송진동Heedae KimWoojin LeeSeongho ParkKwangseuk KyhmKoochul JeRobert A. TaylorGilles NoguesLe Si Dang
Keywords
quantum ring; GaAs; droplet epitaxy
Issue Date
2017-01
Publisher
Scientific Reports
Citation
VOL 7-40026-6
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.
URI
http://pubs.kist.re.kr/handle/201004/66538
ISSN
2045-2322
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KIST Publication > Article
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