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• W2022684142 abstract "Recent advances of femtosecond semiconductor physics at the limits of single electrons and photons down to sub-cycletime scales are presented. The first part deals with ultrafast measurements on single-electron systems: The transientquantum dynamics in a single CdSe/ZnSe quantum dot is investigated via femtosecond transmission spectroscopy. Atwo-color Er:fiber laser with excellent noise performance is key to these first resonant pump-probe measurements on asingle-electron system. We have observed ultrafast bleaching of an electronic transition in a single quantum dot due toinstantaneous Coulomb renormalization. Since we were also able to invert the two-level system, optical gain due to asingle electron has been detected. By using π-pulses for probing, we could deterministically add or remove a singlephoton to or from a femtosecond light pulse, leading to non-classical states of the light field. In order to optimizeelectron-photon coupling, nanophotonic concepts like dielectric microresonators and metal optical antennas are explored.In the second part of the paper, we present multi-terahertz measurements on low-energy excitations in semiconductors.These studies lead towards a future time-domain quantum optics on a time scale of single cycles of light: Intense multiterahertzfields of order MV/cm are used to coherently promote optically dark and dense para excitons in Cu2O from the1s into the 2p state. The nonlinear field response of the intra-excitonic degrees of freedom is directly monitored in thetime domain via ultrabroadband electro-optic sampling. The experimental results are analyzed with a microscopic many-bodytheory, identifying up to two internal Rabi cycles. Subsequently, intersubband cavity polaritons in a quantum wellwaveguide structure are optically generated within less than one cycle of light by a femtosecond near-infrared pulse.Mid-infrared probe transients trace the non-adiabatic switch-on of ultrastrong light-matter coupling and the conversion ofbare photons into cavity polaritons directly in the time domain." @default.
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• W2022684142 date "2010-02-11" @default.
• W2022684142 modified "2023-09-23" @default.
• W2022684142 title "Femtosecond quantum optics with semiconductor nanostructures: single cycles of light, electrons, and photons" @default.
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• W2022684142 doi "https://doi.org/10.1117/12.847159" @default.
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