Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.90: Poster

Monday, March 8, 2004, 16:30–19:00, Poster A

Free-charge carrier properties in AlGaAs/GaAs superlattices investigated by magnetooptic ellipsometry — •Claas von Middendorff¹, Tino Hofmann¹, Gunnar Leibiger², and Mathias Schubert¹ — ¹Fakultät für Physik und Geowissenschaften, Institut für Experimentelle Physik II, Universität Leipzig,Linnéstraße 5, 04103 Leipzig — ²Fakultät für Chemie und Mineralogie, Halbleiterchemie, Universität Leipzig, Linnéstraße 3, 04103 Leipzig

Far-infrared magnetooptic ellipsometry is employed to determine the electron effective mass, the mobility and concentration in Si-doped AlGaAs/GaAs-superlattices at temperatures ranging from 70 to 290 K. We observe a directional dependence of the free-charge carrier mobility. As expected for a system of reduced dimensionality the in-plane mobility is much larger than its out-of-plane component. The parameters are determined by modelling the observed magneto-optic birefringence originating from the far-infrared free-charge carrier excitations in the AlGaAs/GaAs-heterojunctions without any need for additional electrical measurements.