Back to Search
Start Over
Redshift of the excited state due to a nondegenerate biexciton in self-organized quantum dots.
- Source :
-
Journal of Applied Physics . Jun2008, Vol. 103 Issue 11, p113702. 6p. 2 Diagrams, 5 Graphs. - Publication Year :
- 2008
-
Abstract
- Using femtosecond differential transmission spectroscopy, we observed a “nondegenerate” biexciton, consisting of an electron-hole pair in the dot ground state and an electron-hole pair in the excited state, in InGaAs self-organized quantum dots. We resonantly pumped the ground state transition in the quantum dots and observed an induced resonance in the probe differential transmission spectrum near the first excited-state transition, which we attribute to the formation of a nondegenerate biexciton state. The binding energy of 15 meV does not change with excitation power, thus reflecting a genuine feature of few-particle states. Our theoretical model calculations show good agreement with these experimental results. When a prepulse is used to generate a population inversion in the quantum dots, we also observed the effects of nondegenerate biexcitonic correlations in differential transmission. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 103
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 32635190
- Full Text :
- https://doi.org/10.1063/1.2913496