Kim, Heedae Lee, Woojin Park, Seongho Kyhm, Kwangseuk Je, Koochul Taylor, Robert A. Nogues, Gilles Dang, Le Si Song, Jin Dong 2024-01-20T02:31:49Z 2024-01-20T02:31:49Z 2021-09-05 2017-01-05 2045-2322 https://pubs.kist.re.kr/handle/201004/123216 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. English NATURE PUBLISHING GROUP ATOMIC-SCALE STRUCTURE EXCITONS DEPENDENCE Quasi-one-dimensional density of states in a single quantum ring Article 10.1038/srep40026 1 SCIENTIFIC REPORTS, v.7 SCIENTIFIC REPORTS 7 scie scopus 000391190200001 2-s2.0-85008391614 Multidisciplinary Sciences Science & Technology - Other Topics Article ATOMIC-SCALE STRUCTURE EXCITONS DEPENDENCE quantum ring GaAs droplet epitaxy