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HL: Fachverband Halbleiterphysik

HL 31: Poster I: Devices, Quantum Dots and Quantum Wires

HL 31.40: Poster

Dienstag, 23. März 2010, 18:30–20:30, Poster D1

Electric Field and Excitation-Power Dependent Micro-Photoluminescence Spectroscopy of Single In(Ga)As Quantum Dots — •Florian Stockmar, Daniel Rülke, Daniel M. Schaadt, Heinz Kalt, and Michael Hetterich — Institut für Angewandte Physik and DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany

We investigate the excitation-power dependent photoluminescence (PL) of In(Ga)As quantum dots embedded in reversed GaAs micro-pyramids. The pyramidal resonators are fabricated with molecular-beam epitaxy and a combination of e-beam lithography and wet-chemical etching, taking advantage of an AlAs sacrificial layer.By placing the quantum dot layer close to the tip of the pyramids these resonators offer an easy access to the emission of single quantum dots which makes them promising candidates for the realization of single photon sources. Furthermore, we investigate the quantum-confined Stark effect (QCSE) due to laterally applied electric fields. To reveal current-induced thermal contributions to the observed shifts in quantum-dot PL, temporally modulated electric fields are applied in our experiments.