Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of the logarithmic dispersion of high frequency edge
  excitations   We report phase sensitive measurements of microwave propagation through a
high mobility two dimensional electron gas subjected to a perpendicular
magnetic field. Two types of configurations were used, one that allows all wave
vectors q, and one that selects only specific q values. The spectrum of edge
excitations was studied over a broad frequency span, which allowed us to
observe the logarithmic dispersion of edge magneto-plasmons.

9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg