Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 6: Ultrafast Phenoma I
HL 6.5: Vortrag
Montag, 20. März 2017, 10:45–11:00, POT 51
Phonon Wave Packet Emission Signatures in Four-Wave Mixing Micro-Spectroscopy of Single Quantum Dots — •Daniel Wigger1, Tomasz Jakubczyk2,3, Valentin Delmonte2,3, Quentin Mermillod2,3, Doris E. Reiter1, Jacek Kasprzak2,3, and Tilmann Kuhn1 — 1Institut für Festkörpertheorie, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster — 2Univ. Grenoble Alpes, F-38000 Grenoble, France — 3CNRS, Institut Néel, "Nanophysique et Semiconducteurs" Group, F-38000 Grenoble, France
Four-Wave Mixing (FWM) micro-spectroscopy is a powerful tool to investigate the level structure of single emitters. This knowledge is essential for the use of single emitters in quantum technological applications. We investigate single self-assembled Quantum Dots (QDs), which stand out as scalable solid state single emitters but suffer from their inevitable coupling to lattice vibrations. The optical excitation of the QD exciton on the ps timescale leads to the generation of travelling phonon wave packets [1]. This generation of phonons results in a loss of coherence in the excitonic subsystem. For ultrafast excitations this is directly reflected in a rapid drop of the FWM signal. We present a combined theoretical and experimental study on the temperature dependence of the corresponding FWM signals [2].
[1] Wigger et al., J. Phys.: Condens. Matter 26, 355802 (2014)
[2] Jakubczyk et al., ACS Photonics (2016)