Wigner time delay induced by a single quantum dot
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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. This type of time delay was predicted by Wigner in 1955 for purely coherent scattering and was confirmed for an atomic system in 2013 [R. Bourgain et al., Opt. Lett. 38, 1963 (2013)]. In the 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 via a detuning-independent pure dephasing time. We observe detuning-dependent Wigner delays of up to 530 ps in our experiments which are supported quantitatively by microscopic theory allowing for pure dephasing times of up to 950 ps.
Strauss , M , Carmele , A , Schleibner , J , Hohn , M , Schneider , C , Höfling , S , Wolters , J & Reitzenstein , S 2019 , ' Wigner time delay induced by a single quantum dot ' , Physical Review Letters , vol. 122 , no. 10 , 107401 . https://doi.org/10.1103/PhysRevLett.122.107401
Physical Review Letters
Copyright © 2019 American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1103/PhysRevLett.122.107401
DescriptionThe research leading to these results has received funding from the European Research Council (ERC) under the European Union's Seventh Framework ERC Grant Agreement No. 615613 and from the German Research Foundation Project (DFG) No. RE2974/5-1. A.C. and J.S. gratefully acknowledge the support by the DFG through project B1 of the SFB 910. The Wurzburg group is grateful for support by the State of Bavaria.
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