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

Collection with item attached
2017
Item details URL
http://open-repository.kisti.re.kr/cube/handle/open_repository/483855.do
DOI
10.1038/srep40026
Title
Quasi-one-dimensional density of states in a single quantum ring
Description
This work was supported by the National Research Foundation of KoreaGrant (NRF-2014R1A1A2058789) and Pioneer Research(NRF-2013M3C1A3065522).
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.
provenance
Made available in Cube on 2018-09-28T14:57:57Z (GMT). No. of bitstreams: 0
language
English
author
Kim, Heedae
Lee, Woojin
Park, Seongho
Kyhm, Kwangseuk
Je, Koochul
Taylor, Robert A.
Nogues, Gilles
Dang, Le Si
Song, Jin Dong
accessioned
2018-09-28T14:57:57Z
available
2018-09-28T14:57:57Z
issued
2017
citation
SCIENTIFIC REPORTS(7)
issn
2045-2322
uri
http://open-repository.kisti.re.kr/cube/handle/open_repository/483855.do
Funder
과학기술정보통신부
Funding Program
한국과학기술연구원연구운영비지원
Project ID
1711063819
Jurisdiction
Rep.of Korea
Project Name
3-5 on Si, 3-5 CMOS, low power consumption, Si photonics
rights
openAccess
type
article


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