Terahertzspektroskopie an Cu2O: Intraexzitonische und phononische Übergänge (English shop)

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The focus of this work lies clearly in the theoretical and experimental investigation of the intra-excitonic 1s → np transitions in the direct semiconductor Cu2O. First, the fundamental properties of Cu2O were recapitulated, and from the linear optical properties data were already obtained that were of relevance for the later consideration of the intra-excitonic transitions. The investigations of the photoluminescence and the conclusions drawn from them regarding the formation efficiency of the 1s excitons likewise aimed at finding excitation conditions as suitable as possible for the pump-probe experiment. In this context it emerged, among other things, that already for excitation just above the band edge the exciton formation efficiency is about one order of magnitude smaller than for excitation in the phonon-assisted absorption continuum of the 1s orthoexciton. In the description of the experimental methods, a main focus was likewise placed on the pump-probe experiment and the difficulties associated with it.