Dresden 2003 – scientific programme

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HL: Halbleiterphysik

HL 49: Poster II

HL 49.2: Poster

Thursday, March 27, 2003, 16:30–19:00, HSZ/P2

Incompressible Quantum Liquid and Composite Fermions — •U. Schmitt and G. Meissner — Theoretische Physik, Universität des Saarlandes, Postfach 15 11 50, D-66041 Saarbrücken

Dispersion relations for low-energy collective excitations of Laughlin’s incompressible quantum liquid with fractional filling factor one third and of Composite Fermions with the corresponding filling factor one, respectively, are derived using a many-body approach. Modifications due to finite thickness effects of the interacting two-dimensional electron system in high perpendicular magnetic fields are discussed in view of a comparison of the calculated dispersion relations with inelastic light-scattering experiments.