Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 38: Oxide Semiconductors II
HL 38.1: Vortrag
Dienstag, 8. März 2016, 14:45–15:00, H13
Signatures of quantum coherence in Rydberg excitons in Cu2O — •Peter Grünwald1, Marc Aßmann2, Dietmar Fröhlich2, Manfred Bayer2, Heinrich Stolz1, and Stefan Scheel1 — 1Institut für Physik, Universität Rostock, D-18059 Rostock, Germany — 2Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany
In a recent breakthrough experiment, excitons in Cu2O have been optically excited to Rydberg states with principal quantum numbers upto n=25 [1]. These fragile objects show very similar behaviour compared to their atomic counterpart, including the concept of a quantum defect [2].
We present first results on the study of the quantum optical properties of Rydberg excitons. The details of the absorption spectrum of excitons with large n can only be understood by including coherent excitation dynamics [3]. The measured absorption spectrum includes both the probability for absorbing a laser photon as well as a contribution relating to the coherent and incoherent parts of the intensity spectrum of the excitons. For increasing n, the incoherent spectrum becomes relevant. In particular, additional resonances appear between the exciton peaks, which vanish if the laser pumping is substituted for white-light excitation. These resonances indicate the onset of quantum-coherent light-exciton interaction.
[1] T. Kazimierczuk et al., Nature 514, 343 (2014).
[2] F. Schöne et al., arXiv:1511.05458 [cond-mat.mes-hall].
[3] P. Grünwald et al., arXiv:1511.07742 [cond-mat.mes-hall].