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HL: Halbleiterphysik

HL 35: II-VI semiconductors III

HL 35.4: Vortrag

Mittwoch, 29. März 2006, 15:15–15:30, POT 151

Orbital- and Spin Quantization of electronic states as Origins of Second Harmonic Generation in Semiconductors — •Benjamin Kaminski¹, I. Sänger¹, D.R. Yakovlev¹, M. Bayer¹, R.V. Pisarev², and V.V. Pavlov² — ¹Experimentelle Physik II, Universität Dortmund — ²A.A.F.Ioffe Physical Technical Institute, Russian

The application of magnetic-fields to semiconductors enables to investigate their magnetic properties and disclose the energy and spin structure. We use the nonlinear optical technique of second-harmonic generation (SHG) to study diluted-magnetic semiconductors. In the case of diamagnetic CdTe we observe an orbital quantization induced contribution to the SHG signal, whereas the SHG intensity depends quadratically on the applied magnetic field. The same mechanism was observed in GaAs ( Phys. Rev. Lett. 94, 157404 (2005)). In the case of paramagnetic (Cd, Mn)Te another SHG contribution appears. The origin of this contribution is the spin quantization of the electronic states with low Mn content. It is strongly enhanced due to the giant Zeeman splitting effect (see also J. Opt. Soc. Am. B 22, 168 (2005)). The competition of the two mechanisms is investigated for (Cd, Mn)Te with a Mn concentration of 0.001, where the spin and the orbital quantization contributions are of comparable magnitude.