Dresden 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 68: Heterostructures and interfaces

HL 68.8: Vortrag

Mittwoch, 2. April 2014, 16:45–17:00, POT 051

Investigation of interband dynamics in single InAs/GaAs quantum dots — •Daniel Stephan1,2, Jayeeta Bhattacharyya1, Manfred Helm1,2, Yongheng Huo3, Oliver Schmidt3, Armando Rastelli4, and Harald Schneider11Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Technische Universität Dresden, Germany — 3Leibniz Institute for Solid State Materials Research Dresden, Germany — 4Johannes Kepler Universität, Austria

We investigate the dynamics of inter-sublevel transitions in single InAs/GaAs self-assembled quantum dots (QDs). By using a micro-photoluminescence (PL) setup and low-density QD samples, we measure the PL emission from single QDs. The QDs is manipulated by a free-electron laser pulse tuned to the inter-sublevel transition energy, which excites carriers to a higher energy level, from which they decay non-radiatively back to the ground state. The PL is measured spectrally resolved, as well as time-resolved, employing time-correlated single photon counting. In time resolved measurements, the inter-sublevel dynamics causes quenching in the exponential PL decay. In contrast to previous studies on QD ensembles[1,2], the use of single dots eliminates effects such as inhomogeneous broadening and inter-dot transfer, providing a better understanding of inter-sublevel carrier dynamics.

[1] J. Bhattacharyya, et al., Applied Physics Letters 97, 031101 (2010).

[2] J. Bhattacharyya, et al., Applied Physics Letters 100, 152101 (2012).

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2014 > Dresden