Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 74: Focus Session: Semiconductor-based Quantum Communication I
HL 74.2: Topical Talk
Donnerstag, 29. März 2012, 10:00–10:30, ER 164
Electro-elastic Control of Excitons in Semiconductor Quantum Dots — •Armando Rastelli1, Rinaldo Trotta1, Paola Atkinson1, Eugenio Zallo1, Johannes D. Plumhof1, Santosh Kumar1, Fei Ding2, Andreas Herklotz2, Kathrin Dörr1, and Oliver G. Schmidt1 — 1Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Institute for Metallic Materials, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany
Optically active semiconductor quantum dots (QDs) fabricated by epitaxial growth are excellent quantum emitters which may find application in the field of quantum communication. Unavoidable fluctuations inherent to the fabrication process, which lead to a spread in the light emission properties of QD ensembles, hinder the use of most QDs in advanced quantum optics experiments. Post-growth techniques are therefore required to fine-tune the electronic structure of single QDs.
In this talk we will introduce new hybrid devices obtained by integrating semiconductor diode-membranes with embedded QDs onto piezoelectric actuators made of lead magnesium niobate-lead titanate (PMN-PT) single crystals. This combination allows us on one hand to study in detail the effects produced by variable tensile and compressive strains (with magnitude up to about 0.2%) on the excitonic emission of single QDs and on the other to control the emission properties in a broad range by simultaneous application of electric fields and stress. Obtained results and envisioned perspectives will be discussed.