Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 44: Poster Session: Quantum Dots and Wires - Transport & Optical Properties
HL 44.19: Poster
Dienstag, 27. März 2012, 09:30–12:30, Poster D
Optical properties of coupled GaAs Quantum Dots fabricated by double-filling of ultra-low density nanoholes — •Achim Küster, David Sonnenberg, Andreas Graf, Vera Paulava, Christian Heyn, and Wolfgang Hansen — Institut für Angewandte Physik, Universität Hamburg, 20355 Hamburg, Germany
The recent fabrication of self-organized ultra-low density nanoholes in AlGaAs surfaces with depths of approximately 25 nm enables the fabrication of a new type of coupled quantum dots (QD). For this, the nanoholes are filled with two layers of GaAs and an AlGaAs barrier layer of a few nm in between. The sizes of each resulting QD as well as of the barrier layer can be controlled seperately by the thickness of the respective filling layer. The ultra-low nanohole density of 6·106 cm−2 allows for the optical study of a single coupled QD structure without interference from other QDs by using a focused laser for excitation. We study the optical properties of single coupled QD structures using micro-photoluminesence measurements in dependence of the QD size and separation.