Berlin 2005 – scientific programme

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HL: Halbleiterphysik

HL 8: III-V Halbleiter I

HL 8.1: Talk

Friday, March 4, 2005, 11:45–12:00, TU P-N202

Magnetic-Field-Induced Second Harmonic Generation in the Semiconductor GaAs — •Ingo Sänger¹, V.V. Pavlov², A.M. Kalashnikova², R.V. Pisarev², D.R. Yakovlev¹, and M. Bayer¹ — ¹Experimentelle Physik II, Universität Dortmund, 44221 Dortmund, Otto-Hahn-Str. 4, Germany — ²A.F.Ioffe Physical Technic Academy of Sciences, 194021 St. Petersburg, Russia

Magnetic-field-induced signal of second harmonic generation (SHG) was found and investigated in GaAs semiconductor. This phenomenon arises due to the symmetry breaking that leads to new nonlinear optical contributions. A series of narrow SHG lines was observed in the spectral range from 1.52 to 1.77 eV that we attribute to magneto-excitons and Landau-level quantization of the band energy spectrum. Model calculations reveal a nonlinear magneto-optical spatial-dispersion as a dominant mechanism that comes together with the electric-dipole term.