5 research outputs found
Collective Edge Excitations In The Quantum Hall Regime: Edge Helicons And Landau-level Structure
Based on a microscopic evaluation of the local current density, a treatment
of edge magnetoplasmons (EMP) is presented for confining potentials that allow
Landau level (LL) flattening to be neglected. Mode damping due to
electron-phonon interaction is evaluated. For nu=1, 2 there exist independent
modes spatially symmetric or antisymmetric with respect to the edge. Certain
modes, changing shape during propagation, are nearly undamped even for very
strong dissipation and are termed edge helicons.
For nu > 2 inter-LL Coulomb coupling leads to a strong repulsion of the
decoupled LL fundamental modes. The theory agrees well with recent experiments.Comment: 4 pages in Latex/Revtex/two-column format, 3 ps figure