𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Shape-Dependent Exciton Dynamics in InGaAs/GaAs Quantum Dots

✍ Scribed by Heitz, R. ;Born, H. ;Guffarth, F. ;Stier, O. ;Schliwa, A. ;Hoffmann, A. ;Bimberg, D.

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
89 KB
Volume
190
Category
Article
ISSN
0031-8965

No coin nor oath required. For personal study only.

✦ Synopsis

The influence of local charge separation in self-organized In(Ga)As/GaAs quantum dots (QDs) on the exciton dynamics under resonant excitation of the confined exciton in the first excited state is investigated by time-resolved photoluminescence spectroscopy. The oscillator strength and the relaxation rate are shown to depend oppositely on the charge separation, which again depends on the shape and composition profile. A pronounced phonon bottleneck effect is demonstrated for excitons in flat, truncated QDs, whereas recombination-limited dynamics are observed for QDs favouring local charge separation. The results point out possible pathways for optimizing such QDs for device applications.

πŸ“œ SIMILAR VOLUMES

Carrier Dynamics in InGaAs/GaAs Quantum
Carrier Dynamics in InGaAs/GaAs Quantum Dots
✍ S. Marcinkevičius; R. Leon πŸ“‚ Article πŸ“… 1997 πŸ› John Wiley and Sons 🌐 English βš– 131 KB πŸ‘ 1 views
Suppressed Relaxation in InGaAs/GaAs Qua
Suppressed Relaxation in InGaAs/GaAs Quantum Dots
✍ H. Born; R. Heitz; A. Hoffmann; F. Guffarth; D. Bimberg πŸ“‚ Article πŸ“… 2001 πŸ› John Wiley and Sons 🌐 English βš– 89 KB πŸ‘ 2 views

Suppressed relaxation in strongly confined InGaAs/GaAs quantum dots (QDs) was investigated by resonantly excited time-resolved photoluminescence spectroscopy. Hot exciton recombination and temperature-dependent relaxation are demonstrated supporting multi-phonon processes to dominate the relaxation

Exciton Spin Dynamics in Self-Organized
Exciton Spin Dynamics in Self-Organized InAs/GaAs Quantum Dots
✍ Marie, X. ;Jbeli, A. ;Paillard, M. ;Amand, T. ;GοΏ½rard, J.M. πŸ“‚ Article πŸ“… 2002 πŸ› John Wiley and Sons 🌐 English βš– 83 KB πŸ‘ 2 views

The spin dynamics in self-organized InAs/GaAs quantum dots have been studied by time-resolved photoluminescence performed under strictly resonant excitation conditions. It is demonstrated that the carrier spins in these nanostructures are totally frozen on the scale of the exciton lifetime.