Hamburg 2001 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 15: Quanten-Hall-Effekt
HL 15.6: Vortrag
Dienstag, 27. März 2001, 11:45–12:00, S16
Current induced spatial inhomogeneity of photoluminescence of AlGaAs/GaAs heterostructure in quantizing magnetic field. — •Vit Novak1,2, Pavel Svoboda1, Werner Wegscheider2, and Wilhelm Prettl2 — 1Institute of Physics AS CR, Cukrovarnická 10, Prague, Czech Republic — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Germany
Excitonic photoluminescence of a homogeneously illuminated sample with a remotely doped AlGaAs/GaAs heterojunction has been found to be strongly inhomogeneous in space if external current is applied additionaly to a perpendicular magnetic field. A stripe of a quenched PL-intensity has been observed along one of the sample edges, accompanied in some samples by a thin bright contour. The position of the dark stripe changes according to the direction of the Lorentz force, its width varies synchronously with Shubnikov-de Haas oscillations. The influence of the illumination intensity and the sample current has been studied, as well as the role of a parallel real-space conductivity.