Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 44: Quantum Dots: Optical Properties II

HL 44.2: Talk

Tuesday, March 21, 2017, 15:00–15:15, POT 81

Strain tuning of deterministic quantum dot devices — •Esra Burcu Yarar Tauscher, Sarah Fischbach, Alexander Schlehahn, Arsenty Kagansky, Sven Rodt, Tobias Heindel, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany

Quantum light sources (QLSs) are building blocks for future quantum communication technologies. In recent years, significant progress has been achieved in this field, however, still most of the realized structures are based on spatially and spectrally random distributions of quantum emitters. In this regard, it is highly attractive to develop advanced technology platforms ensuring the precise control of the emitter’s properties in deterministically fabricated devices. Self-assembled semiconductor quantum dots (QDs) integrated by in-situ electron-beam lithography into monolithic microstructures are very promising candidates to realize such high performance single photon sources. In this work we report on external strain tuning of deterministically fabricated single-QD devices. For this purpose, we apply voltage control to a ferroelectric material bonded to the single-QD microstructure via thermo-compression gold bonding. This allows us to reproducibly tune the optical properties of QDs, i.e. the emission and binding energies of excitonic complexes. Furthermore, we employ active electric feedback-control enabling long term stability of the emission energy of individual QDs. Our approach, which combines for the first time a deterministic device technology with piezo-tuning capabilities, offers high potential for the realization of bright QLSs with a complete control of their optical properties.