Dynamics of bright and dark excitons in a self-assembled quantum dot

Paul A. Dalgarno, Matthias Ediger, Jason M. Smith, Richard J. Warburton, Khaled Karrai, Alexander O. Govorov, Brian D. Gerardot, Pierre M. Petroff

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

Abstract

We report on a spin-flip process in a charge tunable quantum dot in which a non-radiative dark exciton, with angular momentum L = 2, becomes a radiative bright exciton, L = 1, through interactions with a Fermi sea in an n-doped back contact. This process presents itself by a strongly bias dependent secondary lifetime in radiative lifetime measurements of the neutral exciton. By studying dots with different emission energies the spin-flip process is shown to have a strong dependence on the tunneling rate between the dot and the back contact. An Anderson-like Hamiltonian is used to model a coherent spin swap process between an electron in the dot and electrons in the back contact and gives very good agreement with the experiment. © 2005 American Institute of Physics.

Original languageEnglish
Title of host publicationPHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27
EditorsJ Menendez, CG VanDeWalle
Place of PublicationMELVILLE
PublisherAmerican Institute of Physics
Pages645-646
Number of pages2
Volume772
ISBN (Print)0735402574, 9780735402577
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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    Dalgarno, P. A., Ediger, M., Smith, J. M., Warburton, R. J., Karrai, K., Govorov, A. O., Gerardot, B. D., & Petroff, P. M. (2005). Dynamics of bright and dark excitons in a self-assembled quantum dot. In J. Menendez, & CG. VanDeWalle (Eds.), PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 (Vol. 772, pp. 645-646). American Institute of Physics. https://doi.org/10.1063/1.1994272