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HL: Fachverband Halbleiterphysik

HL 33: Quantum light sources

HL 33.6: Vortrag

Mittwoch, 3. April 2019, 16:30–16:45, H34

Wigner time delay induced by a single quantum dot — •Marcel Hohn¹, Max Strauß¹, Alexander Carmele², Julian Schleibner², Christian Schneider³, Sven Höfling³, Janik Wolters^1,4, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, D-10263 Berlin, Germany — ²Institut für Theoretische Physik, Technische Universität Berlin, D-10263 Berlin, Germany — ³Technische Physik, Physikalisches Institut, Wilhelm Conrad Röntgen Center for Complex Material Systems, Universität Würzburg, D-97074, Germany — ⁴Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland

Resonant scattering of weak coherent laser pulses on a single two-level system (TLS) realized in a semiconductor quantum dot is investigated with respect to a time delay between incoming and scattered light [1]. This type of time delay was predicted by Wigner in 1955 for purely coherent scattering and was confirmed for an atomic system [2]. In presence of electron-phonon interaction we observe deviations from Wigner’s theory related to incoherent and strongly non-Markovian scattering processes which are hard to quantify in a phenomenological T₂-time. We observe Wigner delays of up to 530 ps in our experiments which quantifies the effective pure dephasing constant to T₂ = (445 ± 16) ps, supported by microscopic theory.
[1] M. Strauss et al., arXiv:1805.06357

[2] R. Bourgain et al., Opt. Lett. 38, 1963-5 (2013)