Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deformed Fermi Surface Theory of Magneto-Acoustic Anomaly in Modulated
  Quantum Hall Systems Near $/nu=1/2$   We introduce a new generic model of a deformed Composite Fermion-Fermi
Surface (CF-FS) for the Fractional Quantum Hall Effect near $/nu=1/2$ in the
presence of a periodic density modulation. Our model permits us to explain
recent Surface Acoustic Wave observations of anisotropic anomalies [1,2] in
sound velocity and attenuation- appearance of peaks and anisotropy - which
originate from contributions to the conductivity tensor due to regions of the
CF-FS which are flattened by the applied modulation. The calculated magnetic
field and wave vector dependence of the CF conductivity,velocity shift and
attenuation agree with experiments.

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The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph