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HL: Fachverband Halbleiterphysik
HL 16: Microcavities
HL 16.3: Vortrag
Montag, 14. März 2011, 15:00–15:15, FOE Anorg
Spin mediated magneto-optical cavity quantum electrodynamics effects in quantum dot micropillar systems — •Peter Gold1, Stephan Reitzenstein1, Steffen Münch1, Philipp Franeck1, Andreas Löffler1, Sven Höfling1, Lukas Worschech1, Alfred Forchel1, Ilya Ponomarev2, and Tom Reinecke2 — 1Technische Physik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Naval Research Laboratory, Washington, D.C. 20735, USA
We report on magneto-optical studies of strongly coupled quantum dot - micropillar cavity systems. Laterally extended In0.3Ga0.7As quantum dots (QDs) in the active layer of a micropillar cavity facilitate the observation of strong coupling. These QDs are characterized by large oscillator strength and they exhibit a large diamagnetic response, which is exploited to demonstrate magneto-optical resonance tuning. In addition, the coherent interaction between spin resolved states of the QDs and microcavity photon modes is studied. We access the spin degree of freedom by applying a non-zero magnetic field in Faraday configuration, so that the spin degeneracy of the QD exciton is lifted, while the resonance tuning of the Zeeman split exciton lines is achieved by temperature variation. A detailed oscillator model is used to extract coupling parameters of the individual spin and cavity modes. Our results demonstrate an effective coupling between photon modes that is mediated by the exciton spin states [1]. We further show simulations of the photon-photon coupling in dependence of the coupling parameters.
[1] S. Reitzenstein et al., Phys. Rev. B 82, 121306 (R) (2010)