Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermi pockets and quantum oscillations in specific heat of YBCO in the
  presence of disorder   We investigate a chiral d-density wave (CDDW) mean field model Hamiltonian in
the momentum space suitable for the hole-doped cuprates, such as YBCO, in the
pseudo-gap phase to obtain the Fermi surface(FS)topologies, including the
anisotropy parameter(\'Epsilon) and the elastic scattering by disorder
potential (|v0|). For \'Epsilon = 0, the chemical potential {\mu} = - 0.27 eV
for 10% doping level, and |v0| \geq |t| (where |t| = 0.25 eV is the first
neighbor hopping), at zero/non-zero magnetic field (B), the FS on the first
Brillouin zone are found to correspond to Fermi pockets around anti-nodal
regions and barely visible patches around nodal regions. For \'Epsilon \neq 0,
we find Pomeranchuk distortion of FS. We next relate our findings regarding FS
to the magneto-quantum oscillations in the electronic specific heat. Since the
nodal quasi-particle energy values for B = 0 are found to be greater than {\mu}
for |v0| \geq |t|, the origin of the oscillations for non-zero B corresponds to
the Fermi pockets around anti-nodal regions. The oscillations are shown to take
place for 17 T \leq B \leq 53 T and beyond in the weak disorder regime
(|v0|=0.25eV) only.

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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc