Regensburg 2002 – scientific programme
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HL: Halbleiterphysik
HL 11: Poster 1
HL 11.39: Poster
Monday, March 11, 2002, 17:00–19:30, Poster A
Photoluminescence portrait of 2-DEG in strong magnetic fields — •Vít Novák1,2, Pavel Svoboda1, Miroslav Cukr1, Werner Wegscheider2, and Wilhelm Prettl2 — 1Institute of Physics AS CR, Cukrovarnická 10, Prague, Czech Republic — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg
Photoluminescence images of a sample with two-dimensional electron gas confined at a GaAlAs/GaAs interface have been obtained by an infrared-sensitive camera. It has been found that the spatial distribution of photoluminescence is always in a characteristic way inhomogeneous, if a strong perpendicular magnetic field and an external current are applied. Well defined areas of quenched photoluminescence are observed, whose size and form vary synchronously with Shubnikov-de Haas oscillations. In some cases the quenching mechanism can be attributed to a self-induced vertical electric field, in other cases it corresponds to a macroscopic current bunching.