Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.12: Poster

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

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

Dispersion relations for spin-flip modes of composite Fermions are examined by employing a Chern-Simons gauge theory in the limit of low Zeeman energy. The calculated finite-wave-vector excitations, in which a spin-reversed composite Fermion of the spin-polarized filled lowest Landau level is promoted to the next, are compared with the collective excitations of Laughlin’s incompressible quantum liquid at the corresponding fractional filling factor one third. Modifications due to finite thickness effects in this interacting two-dimensional electron system at high magnetic fields are considered in view of a comparison of the calculated dispersion relations with inelastic light-scattering experiments.