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HL: Halbleiterphysik

HL 17: Poster Ib

HL 17.17: Poster

Friday, March 4, 2005, 16:30–19:00, Poster TU F

Phonon and free-charge-carrier properties in — •Tino Hofmann¹, Bruno Daniel², Kapil Chandra Agarwal², Michael Hetterich² und Mathias Schubert¹ — ¹Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Universität Leipzig, Linnéstraße 5, 04103 Leipzig — ²Institut für Angewandte Physik, Universität Karlsruhe, Wofgang-Gaede-Straße 1, 76131 Karlsruhe

Zn_1−xMn_xSe is a potential spin aligner in spintronic devices. We determine the free-charge-carrier effective mass m of doped n-type Zn_1−xMn_xSe:Cl grown by molecular beam epitaxy using magnetooptic generalized ellipsometry at far-infrared wavelengths (100−650  cm⁻¹) and external magnetic fields B = ±3 T. A clear decrease of m(Zn_1−xMn_xSe, x>0) compared with m(ZnSe) is observed. We furthermore report on the composition dependent MnSe- and ZnSe-like phonon mode frequencies for the composition range from x=0 to 0.2.