Dresden 2009 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 39: Quantum dots: Optical and transport properties
HL 39.3: Vortrag
Donnerstag, 26. März 2009, 10:00–10:15, BEY 81
Triggered single-photon source from a single quantum dot on silicon substrate — •Mohamed Benyoucef1,2, Hong Seok Lee1, Juliane Gabel1, Armando Rastelli1, and Oliver G. Schmidt1 — 1Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden, Germany — 2Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany
Single quantum emitters have become an emerging area of fundamental research during the last years, driven by the need for nonclassical light sources delivering single-photons on demand for future implementation in the field of quantum information. Most of the work concerning photon statistics has been done on III-V materials such as (In,Ga)As quantum dots (QDs) embedded in GaAs matrix or integrated in microcavities. In contrast to this, only few studies on II-VI compounds have been reported. The short lifetime of II-VI QDs could allow operation at high repetition rates. From the technological point of view it would be desirable to obtain single-photons on demand from single QDs grown on Si(001) substrates. In this work, we report on the observation of triggered single-photon emission from a single CdTe QD embedded in a ZnTe layer grown on Si(001). The emission wavelength of single dots can be locally tuned in a wide spectral range (more than 8 meV) by means of a focused laser beam. Moreover, we have carried out time-resolved PL measurements to investigate the lifetime of the single CdTe QDs. We find that, the single-photon emission and the lifetime are preserved after energy tuning of the QD emissions.