Impact of lateral carrier confinement on electro-optical tuning properties of polariton condensates
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Electro-optical measurements on exciton-polaritons below and above the condensation threshold are performed on high quality, pin-doped microcavities with embedded GaAs quantum wells. Applying an external electric field shifts the polariton emission by hundreds of μeV both in the linear and the nonlinear regime. We study three device geometries to investigate the influence of carrier confinement in the plane of the quantum well on the electro-optical tuning properties. In the conventional micropillar geometry, the electric field tuning behavior is dominated by the effects of carrier tunneling and electric field screening that manifest in a blueshift of the polariton emission. In stark contrast, for a planar sample geometry, we can significantly extend the range of electric fields and a redshift is observed. To separate the contributions of quantum confined Stark effect and reduced exciton oscillator strength to the energy shift, we study a third sample where the etching of micropillars is stopped just above the active region. In this semi-planar geometry, exciton and polariton emissions can be measured simultaneously. As for the planar geometry, redshifts of the polariton emission are observed below and above threshold that are well reproduced by theoretical shifts.
Brodbeck , S , Suchomel , H , Amthor , M , Wolf , A , Kamp , M , Schneider , C & Höfling , S 2015 , ' Impact of lateral carrier confinement on electro-optical tuning properties of polariton condensates ' Applied Physics Letters , vol 107 , no. 4 , 041108 . DOI: 10.1063/1.4927601
Applied Physics Letters
© 2015 AIP Publishing LLC. This work is 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 http://dx.doi.org/10.1063/1.4927601
This work was supported by the State of Bavaria. S.H. gratefully acknowledges support by the Royal Society and the Wolfson Foundation.
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