Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.58: Poster
Mittwoch, 22. März 2017, 15:00–19:00, P1A
Internal wavelength stabilization of a quantum dot photon source — •Amran Al-Ashouri1, Annika Kurzmann1, Benjamin Merkel1, Arne Ludwig2, Andreas D. Wieck2, Axel Lorke1, and Martin Geller1 — 1Faculty of Physics and CENIDE, University of Duisburg-Essen, Germany — 2Chair for Applied Solid State Physics, Ruhr-Universität Bochum, Germany
Single-photon sources are desirable for many quantum optical experiments and are essential for a practicable implementation of quantum networks. Being able to emit antibunched, indistinguishable photons with a high flux, epitaxially grown quantum dots (QDs) are a realistic choice for building such sources. Furthermore, QD systems are conveniently integrable into existing semiconductor technologies, however, charge and spin noise are ubiquitous in common host materials, introducing random wavelength fluctuations of the emitted photons.
In this work, single self-assembled InAs QDs are used to demonstrate a noise-suppressing, internal feedback loop [1]. This feedback loop leads to a stabilization scheme that relies solely on charge carrier dynamics inside a Schottky diode heterostructure, in which a QD layer is embedded. Key to the observed effect is micropillar patterning, leading to charge storage near the QDs. First measurements show a noise filtering bandwidth of 10 Hz and model calculations are in good agreement with our data. With optimized material parameters, our model predicts bandwidths of several 100 kHz, enough for eliminating most noise and enabling wavelength-stabilized photon emission.
[1] B. Merkel et al., arXiv:1606.03215 [cond-mat.mes-hall] (2016).