Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 69: Poster Session: II-VI semiconductors; Organic semiconductors; Heterostructures

HL 69.3: Poster

Mittwoch, 13. März 2013, 16:00–20:00, Poster A

Magneto-Stark effect on excitons in ZnO investigated by nonlinear optical spectrosopy — •David Brunne¹, Marco Lafrentz¹, Victor V. Pavlov², Roman V. Pisarev², Anna Rodina², Dmitri R. Yakovlev^1,2, Dietmar Fröhlich¹, and Manfred Bayer¹ — ¹Experimentelle Physik 2, Technische Universitaet Dortmund, D-44221 Dortmund, Germany — ²Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

The magneto-Stark effect on moving excitons is proved as a driving mechanism enabling resonant second harmonic generation (SHG) in hexagonal ZnO. Strong SHG signals induced by external magnetic fields are observed in the spectral range of 2s and 2p excitons. Theoretical microscopic analysis shows, regardless the fact that the magnetic field is an even parity perturbation, for excitons with a finite k-vector wave functions of opposite parities are mixed by an effective odd parity electric field. Magnetic field, spectral and polarization dependencies of SHG intensity confirm the proposed mechanism.