Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 38: Oxide Semiconductors II

HL 38.3: Vortrag

Dienstag, 8. März 2016, 15:15–15:30, H13

Stark-Effect Measurements on Rydberg Excitons in Cu₂O — •Marcel Freitag, Julian Heckötter, Marc Aßmann, Dietmar Fröhlich, and Manfred Bayer — Technische Universität Dortmund, Fakultät Physik, Experimentelle Physik II, 44221 Dortmund, Germany

We report on Stark-Effect measurements of Rydberg excitons¹ in Cu₂O with quantum numbers up to n=25. These excitons have extensions up to 2 µm. As known from hydrogen, the dipole matrix elements for Δ n=0 and Δ l=± 1 grow quadratically with n. Due to the electric field induced coupling, we observe S- and D-excitons of the yellow series and from n=5 we are even able to identify G-excitons in fields as low as 50 V/cm. Measurements are done on a 30 µm sample with a single frequency dye laser (Δ E=5 neV) and a broadband whitelight source at temperatures down to 1.2 K. Contrary to hydrogen, the Stark-Effect measurements can be done in a longitudinal configuration (K_laser ∥ E).

¹ T. Kazimierzuk et al. Nature 514, 343 (2014)