Hannover 2016 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.42: Poster

Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof

Rydberg excitons in artificially grown cuprous oxide — •Moritz Fischer, Tobias Steinle, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, Stuttgart, Germany

We investigate the yellow exciton series in an artificially grown crystal of cuprous oxide (chemical formula Cu2O) at low temperatures (1.9 K). The yellow green light (close to 571 nm) is generated by a combination of an external cavity diode laser and second-harmonic generation in a waveguide of lithium niobate. To our knowledge it is the first time that yellow excitons are observed in an artificially grown crystal of cuprous oxide. We achieved excitons with principal quantum numbers from n=4 to n=9. From the transmission spectrum we calculated the band gap to 2.172 04 eV of cuprous oxide and the Rydberg energy of the yellow excitons to 94.75 meV. The current limitation is the phonon-assisted absorption in lower excitonic states. We further investigate the opportunities of fiber-based measurement techniques in reflection in order to reach lower temperatures (50 mK) and overcome the critical issue of the sample thickness.