Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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.

29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess