Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 12: Poster I

HL 12.38: Poster

Monday, March 8, 2004, 16:30–19:00, Poster A

Structure of Spin-Flip Excitations in Interacting Electron Systems at High Magnetic Fields — •U. Schmitt and G. Meissner — Theoretische Physik, Universität des Saarlandes, Postfach 15 11 50, D-66041 Saarbrücken

Similarities found in the structure of certain inter-Landau level and intra-Landau level collective excitations of systems exhibiting the integer and the fractional quantum Hall effect, respectively, are examined. Therefore, we compare results obtained, e.g., for the dispersion relation of the spin-flip mode between the filled lowest Landau level and the next and for the collective excitations of Laughlin’s incompressible quantum liquid at the corresponding filling factor one third according to the composite Fermion picture. Modifications due to finite thickness effects in these interacting two-dimensional electron systems at high magnetic fields are discussed in view of a comparison of the calculated dispersion relations with inelastic light-scattering experiments.