Photoluminescence rings in Corbino disk at quantizing magnetic fields

Details Photoluminescence rings in Corbino disk at quantizing magnetic fields Photoluminescence rings in Corbino disk at quantizing magnetic fields

2004-08-12

arxiv.org/abs/cond-mat/0408274v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 two-column pages, 4 figures (one of them in color)

Scientific paper

10.1103/PhysRevB.70.155331

Spatially resolved photoluminescence of modulation doped AlGaAs/GaAs heterojunction was investigated in a sample of Corbino disk geometry subject to strong perpendicular magnetic fields. Significant spatial modulation of the photoluminescence was observed in form of one or more concentric rings which travelled across the sample when the magnetic field strength was varied. A topology of the observed structure excludes the possibility of being a trace of an external current. The effect is attributed to formation of compressible and incompressible stripes in a 2DEG density gradient across the sample.

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