Probing different regimes of strong field light-matter interaction with semiconductor quantum dots and few cavity photons
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In this work we present an extensive experimental and theoretical investigation of different regimes of strong field light-matter interaction for cavity-driven quantum dot-cavity systems. The electric field enhancement inside a high-Q micropillar cavity facilitates exceptionally strong interaction with few cavity photons, enabling the simultaneous investigation for a wide range of QD-laser detuning. In case of a resonant drive, the formation of dressed states and a Mollow triplet sideband splitting of up to 45 μeV is measured for a mean cavity photon number ⟨nc⟩ ≤ 1. In the asymptotic limit of the linear AC Stark effect we systematically investigate the power and detuning dependence of more than 400 QDs. Some QD-cavity systems exhibit an unexpected anomalous Stark shift, which can be explained by an extended dressed 4-level QD model. We provide a detailed analysis of the QD-cavity systems properties enabling this novel effect. The experimental results are successfully reproduced using a polaron master equation approach for the QD-cavity system, which includes the driving laser field, exciton-cavity and exciton-phonon interactions.
Hargart , F , Roy-Choudhury , K , John , T , Portalupi , S L , Schneider , C , Höfling , S , Kamp , M , Hughes , S & Michler , P 2016 , ' Probing different regimes of strong field light-matter interaction with semiconductor quantum dots and few cavity photons ' New Journal of Physics , vol 18 , 123031 . DOI: 10.1088/1367-2630/aa5198
New Journal of Physics
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We acknowledge financial support of the Deutsche Forschungsgemeinschaft (DFG) within the SFB/TRR21 and the projects MI500/23-1 and Ka2318/4-1, the Natural Sciences and Engineering Research Council of Canada, and from the open access fund of the University of Stuttgart.
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