Szczegóły publikacji
Opis bibliograficzny
Effect of the repulsive core on the exciton spectrum in a quantum ring / B. SZAFRAN, J. ADAMOWSKI, S. BEDNAREK // Journal of Physics : Condensed Matter ; ISSN 0953-8984. — 2002 — vol. 14 no. 1, s. 73–86. — Bibliogr. s. 86, Abstr.
Autorzy (3)
Dane bibliometryczne
| ID BaDAP | 11906 |
|---|---|
| Data dodania do BaDAP | 2003-02-21 |
| Rok publikacji | 2002 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Physics-Condensed Matter |
Abstract
A theoretical study of an exciton confined in a quantum ring is presented. The quantum ring is described as a two-dimensional circular quantum dot with a repulsive core, which is modelled with the help of two Gaussian functions. We have applied the variational method and investigated the evolution of the low-energy exciton spectrum with the change of the confinement potential. The calculations have been performed for the recently produced self-assembled ring-shaped InGaAs quantum dots. We have shown that the repulsive core strongly increases the radiative transition probability from the exciton ground state at the expense of the decreasing probability of the transitions from the excited states. This effect results from the orthogonality properties of the exciton wavefunctions, which are specific to the quantum-ring confinement potential. We have studied the characteristic features of the exciton spectrum, which can be used as a signature of the presence of the repulsive core in the quantum-dot potential.
