Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Composite Fermions with a Warped Fermi Contour   Via measurements of commensurability features near Landau filling factor
$\nu=1/2$, we probe the shape of the Fermi contour for hole-flux composite
fermions confined to a wide GaAs quantum well. The data reveal that the
composite fermions are strongly influenced by the characteristics of the Landau
level in which they are formed. In particular, their Fermi contour is
$\textit{warped}$ when their Landau level originates from a hole band with
significant warping.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
3
The categories of this paper are: physics
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The categories of this paper are: comp-gas
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg