Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.16: Poster

Dienstag, 8. März 2005, 16:30–19:00, Poster TU F

Composite fermions in disordered systems — •Christian Müller and Daniela Pfannkuche — Institut für Theoretische Physik Universität Hamburg

The electronic properties of a disordered system in the fractional quantum Hall regime are studied. To this end, the correlation of wavefunction vortices (Composite Fermions) and electrons are studied in a system subject to periodic boundary conditions using exact diagonalization methods for up to 5 spin-polarized electrons. The model impurity is of gaussian shape.

For a strong gaussian-shaped impurity potential a quantized charging of the resulting quantum dot is found. The vortex-vortex correlation becomes weaker for stronger disorder potentials, pointing to a possible breakdown of the FQH regime.