Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermi Surface of Bi2212: a Systematic Revisit and Identification of
  Almost Perfectly Nested Fermi Surface Segments   The Fermi surface of the Bi2212 system is systematically studied using a
variety of photon energies. In addition to reconciling the conflicting reports
on the Fermi surface of this important material, we identify almost perfectly
nested Fermi surface segments parallel to the $(1,0)$ or $(0,1)$ direction.
This general yet long overlooked feature of the Fermi surface is intriguingly
similar to the Fermi surface of the $La_{1.48}Nd_{0.4}Sr_{0.12}CuO_4$ system.

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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: hep-ph