Berlin 2018 – wissenschaftliches Programm

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SYSD: Symposium SKM Dissertation-Prize 2018

SYSD 1: SKM Dissertation-Prize 2018

SYSD 1.1: Hauptvortrag

Montag, 12. März 2018, 11:00–11:20, HE 101

Optical detection of charge carrier dynamics in a self-assembled quantum dot — •Annika Kurzmann — Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstr. 1, 47057 Duisburg, Germany

One of the central visions in quantum information processing is the realization of a quantum network, where information exchange is based on the storage and transfer of quantum states (QuBits). Self-assembled quantum dots (QDs) allow both, the storage of QuBits as charge- or spin states and their transfer via single photons. Therefore, quantum dots are one promising candidate as nodes in a quantum network.

In this work, resonance fluorescence on a single self-assembled dot was used to investigate three important aspects for QDs as quantum nodes: (i) Single photon generation with narrow linewidth, using a feedback loop, where tunneling of resonantly generated holes lead to a stabilization of the QDs emission [1]. (ii) The coupling mechanism of the QD to the charge reservoir, that is important for the electrical control of the dots states. In real-time measurements [2] quantum jumps of electron tunneling were measured, that give access to the statistics of the fluctuations, i.e. shot noise and Fano factor. (iii) The non-radiative Auger recombination, an important detrimental mechanism inside an optically-excited dot, that leads to linewidth broadening and intensity quenching of the excitonic resonances [3].

[1] B. Merkel et al., Phys. Rev. B 95, 115305 (2017). [2] A. Kurzmann et al., Phys. Rev. Lett. 117, 017401 (2016). [3] A. Kurzmann et al., Nano Lett. 16, 3367 (2016).