4 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
Plasmon Modes and Correlation Functions in Quantum Wires and Hall Bars
We present microscopic derivations of the one-dimensional low-energy boson
effective Hamiltonians of quantum wire and quantum Hall bar systems. The
quantum Hall system is distinguished by its spatial separation of oppositely
directed electrons. We discuss qualitative differences in the plasmon
collective mode dispersions and the ground state correlation functions of the
two systems which are consequences of this difference. The slowly-decaying
quasi-solid correlations expected in a quantum wire are strongly suppressed in
quantum Hall bar systems.Comment: 7 pages, RevTex, 3 figures and 1 table included; references updated
and minor typos correcte