Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 90: Poster Session: Quantum information systems; Optical properties; Ultrafast phenomena
HL 90.11: Poster
Donnerstag, 14. März 2013, 16:00–20:00, Poster A
Strong light-matter coupling between photons and several excitonic states in ZnO-based microcavities — •Martin Thunert, Hannes Krauß, Helena Franke, Chris Sturm, Rüdiger Schmidt-Grund, and Marius Grundmann — Universität Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, 04103 Leipzig
We report on the observation of strong coupling between cavity-photons and free single particle excitonic states as well as bound or free exciton-complex states in ZnO-based microcavities via PL and reflectivity measurements. While the coupling to the free exciton states is present in each case, the coupling to the two types of complex excitonic structures seems to be present in two situations:
1.) In the case of a low-temperature grown but annealed cavity we have observed the additional coupling of the cavity-photon to the donor bound excitons (D0,X), which are strongly localized.
2.) In a cavity grown at high temperature, we have observed coupling to exciton-phonon complexes. Each of both contributions to the polaritons are observed by an additional branch in the polariton dispersion. While the coupling to the (D0,X) has a low coupling strength due to its low density in the cavity, the coupling strength for the exciton-phonon complexes is found to be similar to that for the free excitons.
The different excitonic contributions could be ascribed to different crystal quality of the cavity material for the two types.