Dresden 2006 – scientific programme

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HL: Halbleiterphysik

HL 7: Quantum dots and wires: Optical properties I

HL 7.1: Talk

Monday, March 27, 2006, 10:15–10:30, POT 151

Spectral jitter in cathodo- versus photoluminescence of single InGaAs quantum dots — •Erik Stock, Till Warming, Robert Seguin, Sven Rodt, Konstantin Pötschke, and Dieter Bimberg — Institut für Festkörperphysik, TU Berlin, Hardenbergstr. 36, D-10623 Berlin

Spectral jitter in the lumiscence of single quantum dots (QD) has been regulary observed. This jitter is attributed to the quantum confined Stark effect, induced by local electrical fields near the QDs. For future single QD devices this jitter might be harmfull (for example for coupling to a microcavity) Here we present a comparison of the jitter of the same single QD using cathodoluminescence (CL) and micro-photoluminescence (PL). In CL the primary electrons have larger energy, then the exciting photons in PL. We observe that the amplitude of the jitter in CL is much larger then in PL experiments. We conclude that it is impossible to extract information about the structural quality of QD heterostructures by comparison of the jitter in single dot luminescence measurements, done with different excitation sources.

This work was partly funded by the SANDiE Network of Excellence of the European Commission, contract number NMP4-CT-2004-500101 and SFB296 of DFG.