Electronic transitions in biaxial F-ZnPz are studied by two-photon absorption. The anisotropy of the crystal leads to a large energy splitting of the P excitons. The energy shift of the P excitons and Landau transitions axe observed in a magnetic field up to 6T. We present a theory which describes the anisotropic P excitons in a magnetic field. The analysis of the experimental data allows the determination of the anisotropic dielectric constants and effective masses of the valence and conduction bands.
An analytical formula is proposed that describes magneto-optical data of heavy hole S-and P-magnetoexcitons in quantum wells quite well. The open coeficients in this formula have been fitted to numerically derived magnetoexciton energies. Experimental results for S -and P-magnetoexcitons are presented obtained from one-and two-photon excitation spectroscopy. It is possible to extract parameters for conduction band and valence band separately, while band mixing is taken into account by nonparabolicity parameters. The investigation shows that the dominant features of the spectra can be quantitatively described in the frame of a two-band model.Es wird eine analytische Formel vorgestellt, mit der S-und P-Magnetoexzitonen aus optischen Messungen gut beschrieben werden konnen. Die freien Parameter in dieser Formel wurden so gewahlt, daB sich eine optimale ubereinstimmung mit numerisch berechneten Magnetoexzitonenergien ergibt. Es werden experimentelle Ergebnisse zu S-und P-Magnetoexzitonen vorgestellt, die mit Ein-Photonenund Zwei-Photonen-Anregungsspektroskopie gemessen wurden. Damit ist es moglich, Parameter fur das Leitungsband und das Valenzband getrennt zu bestimmen. Die Mischung der Bander wird iiber Nichtparabolizitaten beriicksichtigt. Es zeigt sich, daB die dominierenden Ubergange in den Spektren quantitativ im Rahmen eines Zweiband-Modells beschrieben werden konnen.
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