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HL: Fachverband Halbleiterphysik

HL 24: Poster Session II

HL 24.18: Poster

Dienstag, 13. März 2018, 18:30–20:30, Poster F

Room-temperature photoluminescence mapping of GaAs quantum dots — •Roman Korneev, Michael Zocher, Christian Heyn, and Wolfgang Hansen — Center for Hybrid Nanostructures, University of Hamburg, D-22761 Hamburg, Germany

We study the photoluminescence (PL) emission from spatially well separated GaAs quantum dots (QDs) in refilled AlGaAs nanoholes at room temperature (RT). The self-assembled nanoholes are produced by local droplet etching during molecular beam epitaxy. Afterwards, the holes are filled with GaAs and capped with AlGaAs for QD generation. At T = 4 K, the QDs show clear excitonic peaks and nearly perfect single-photon emission. On the other hand, at RT the intensity of emitted light is strongly reduced. Although the emission of an ensemble of QDs is easily detected, the study of single QD emission at RT remains difficult. We demonstrate the detection of single-dot emission at RT by using a modified Raman microscope. Furthermore, a xy-stage allows us to produce PL maps of the samples. PL maps recorded at different wavelengths will be discussed in view of the QD ensemble properties like the density and the average luminescence energy.