Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 19: Materials and Devices for Quantum Technology 1

HL 19.5: Talk

Wednesday, September 7, 2022, 10:45–11:00, H34

Design study of electrically contacted quantum dot circular Bragg gratings — •Quirin Buchinger, Tobias Huber, and Sven Höfling — Technische Physik, Universität Würzburg, 97074 Würzburg, Germany

Recently, photonic quantum networks receive a lot research interest. Semiconductor quantum dots offer a local memory, utilizing single spins and are highly efficient single or entangled photon sources. Therefore, they are among suitable candidates for a scalable hardware platform for quantum networks. To enhance brightness and extraction efficiency the quantum dots are typically embedded into microcavities, here circular Bragg gratings. By incorporating the quantum dots into a diode structure they can be charged with a single electron or hole and thus generate a ground state spin qubit [1]. This provides opportunity for spin photon coupling [2]. To apply voltage to the quantum dot inside of a circular Bragg grating, bridges through the etched rings have to be leaved unetched as a path for the current to the central disc of the microcavity. We discuss different layouts of these bridges and their influence on cavity wavelength, quality factor and polarisation.

[1] Warburton, R., Nature Mater 12, 483-493 (2013)

[2] De Greve, K., et al. Nature 491, 421-425 (2012)