SKM 2021 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: Poster Session II

HL 8.8: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Semiconductor nanophotonic light sources with site- and number- controlled quantum dots for the investigation of collective effects — •Ching-Wen Shih, Jan Große, Imad Limame, Chirag Palekar, Yuhui Yang, Lasse Kosiol, Sebastian Krüger, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, Berlin, Germany

Sub- and superradiance are intriguing collective radiative emission processes which occur when coherence is built up among the emitters spontaneously via exchange of photons. Semiconductor quantum dots (QDs) are attractive candidates to study these collective emission processes. However, a systematic study of the collective effects in these semiconductor nanostructures requires a control over the position, number, and emission energy of the quantum dot emitters. We report on the development of nanophotonic light sources via a buried-stressor approach, which enables a precise position control of the InGaAs QDs by tailoring the strain induced by an oxidation aperture. Furthermore, the number of such site-controlled QDs is successfully varied from 0 to 20 across each device via a careful balance between the aperture size and the MOCVD growth condition. Finally, electron beam lithography is implemented to pattern micro-mesa cavity structures, which enhance the photon extraction efficiency of the QDs to facilitate the observation of sub- and superradiance.