Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: van Hove Singularity effects in Strongly Correlated Fermions   We examine the effects of a van Hove singularity (vHs) in the density of
states (DOS) of a two dimensional, $t-t'-U$ Hubbard model within the local
approximation. Within our approximation the non-interacting Fermi surface is
always retained away from half-filling; and we find that the vHs in the DOS
survives, and for hole doping is nearly "pinned" to the Fermi level due to the
enhancement of the effective mass, $m^*$. We discuss the electron-hole
asymmetry of this phenomena and its relevance to the electron and hole doped
cuprates. At optimal (hole) doping, with the Fermi level at the vHs, we find
that the single particle damping rate $\Gamma$, and the resistivity
$\rho_{dc}$, scale as $T$ for moderately low temperatures ($T \gtrsim 100$K),
while for the electron doped system $\Gamma $ and $\rho_{dc} \sim T^2$.

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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
1
The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
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The categories of this paper are: econ
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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: nucl-th
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The categories of this paper are: mtrl-th