Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 27: Zinc Oxide and Zinc Selenide

HL 27.10: Vortrag

Dienstag, 8. März 2016, 12:15–12:30, H17

Magnetic-Field-Induced Second-Harmonic Generation in ZnSe — •Johannes Mund¹, Walter Warkentin¹, and Dmitri Yakovlev^1,2 — ¹Experimentelle Physik 2, Technische Universität Dortmund, 44221 Dortmund, Germany — ²Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia

We apply femtosecond laser pulses to ZnSe bulk material to investigate exciton resonances. The non-linear technique of optical second harmonic generation (SHG) allows us to test other excitation rules than in linear optics. Despite the broad bandwidth of the laser pulses we succeed to measure narrow exciton resonances. We present measurements in different crystal directions without and in magnetic fields in voigt and faraday configuration. The polarisation dependency of the SHG intensity is analysed as well. Especially incident light in (100)-direction is of interest as the process of SHG is forbidden in this geometry in the electric-dipole approximation without magnetic field. The application of a magnetic field up to 10 T leads to a rich spectrum of exciton resonances which can be assigned to envelope-hole coupling of the 2P exciton and to landau-levels of the 2P and 3P exciton by comparison with calculations.