Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: HL Poster II

HL 35.44: Poster

Mittwoch, 3. April 2019, 17:30–20:00, Poster E

Capacitance-voltage spectroscopy and temperature dependent photoluminescence spectroscopy on λ = 1.55 μm quantum dots — •Tim Bergmeier, Marcel Schmidt, Andreas Dirk Wieck, and Arne Ludwig — Institut für angewandte Festkörperphysik, Ruhr-Universität Bochum

Single λ=1.55 μm-wavelength photons are ideal for quantum communication, as fibre losses are minimal at this wavelength. Quantum dots can function as ideal single photon sources [Kuhlmann et al., Transform-limited single photons from a single quantum dot, Nat. Commun. 6, 8204 (2015)]. However, excellent photon quality is not yet achieved at the desired wavelength due to material issues accompanying needed metamorphic strain reduction layers, grown on GaAs substrates. We present temperature dependent photoluminescence spectroscopy and capacitance-voltage spectroscopy on molecular beam epitaxy-grown self-assembled InAs/InGaAs quantum dots emitting at λ=1.55 μm. We discuss the results in the framework of trap associated charge and non-radiative recombination processes.