Forbidden transitions in the emission spectrum of charged excitons in a single semiconductor quantum dot

M. Ediger, R. J. Warburton, K. Karrai, B. D. Gerardot, P. M. Petroff

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

New optical transitions in charged self-assembled InAs quantum dots have been investigated. The main optical emission is due to fast recombination of holes and electrons from their respective s levels. But photoluminescence (PL) experiments on quantum dots embedded in a vertical tunneling structure reveal a new group of weak lines blueshifted from the main s-s PL by 15 meV. These lines arise as the electronic p shell is first populated for the doubly negatively charged exciton, X2-, induced by the vertical electric field. We therefore attribute these lines to s-p transitions, which are only possible to observe due to the breaking of the rotational symmetry in a real dot and provide a measure of its extent. These transitions show two remarkable effects. First, the population of the wetting layer splits the PL and accordingly the p sub-shells into two branches analogous to a magnetic field. Secondly the s-p PL retains in contrast to the s-s emission a small linewidth up to X6- after the wetting layer is populated. This can be explained by an intra-dot interaction triggered by the s shell vacancy present in the s-s final state but not in the s-p final state. © 2005 American Institute of Physics.

Original languageEnglish
Title of host publicationPHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27
Pages739-740
Number of pages2
Volume772
DOIs
Publication statusPublished - 30 Jun 2005
Event27th International Conference on the Physics of Semiconductors - Flagstaff, Arizona, Argentina
Duration: 26 Jul 200430 Jul 2004

Conference

Conference27th International Conference on the Physics of Semiconductors
Abbreviated titleICPS-27
CountryArgentina
CityFlagstaff, Arizona
Period26/07/0430/07/04

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    Ediger, M., Warburton, R. J., Karrai, K., Gerardot, B. D., & Petroff, P. M. (2005). Forbidden transitions in the emission spectrum of charged excitons in a single semiconductor quantum dot. In PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 (Vol. 772, pp. 739-740) https://doi.org/10.1063/1.1994318