Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 26: III-V semiconductors I
HL 26.10: Vortrag
Dienstag, 26. Februar 2008, 18:00–18:15, EW 202
Interactions of space-charge waves with magnetic fields in the semiconductor InP:Fe — •Burkhard Hilling1, Michaela Lemmer1, Micro Imlau1, Manfred Wöhlecke1, Valerij Bryksin2, and Mikhail Petrov2 — 1Department of Physics, University of Osnabrück — 2Ioffe Physico-Technical Institute, St. Peterburg, Russia
We report on the interaction of space-charge waves (SCW) with magnetic fields in semi-insulating InP:Fe single crystals. SCW are eigenmodes of spatial-temporal oscillations of a space-charge density. The optical excitation of SCW is performed with an oscillating interference pattern at a wavelength of λ = 514 nm and externally applied static electric fields of several kV/cm. The interference pattern is generated with a two beam interferometer, where one of the beams is phase-modulated using an electro-optic modulator. An influence of the magnetic field of up to B=0.86 T on the amplitude of the SCW is observed. This influence reveals a quadratic behavior and depends strongly on the orientation of the magnetic field. The observed dependences give strong evidence for a dominant contribution of the magnetoresistance to this effect. The dependence of the variations of the amplitude on the wavevector of the SCW implies that measurements with SCW inside a magnetic field can be more precise than ordinary techniques to determine the magnitude of the magnetoresistance. Furthermore, advantages of this technique for material analysis are discussed. Financial support from the Deutsche Forschungsgemeinschaft (GRK 695) is gratefully acknowledged.