Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling scanning tunneling spectra of $Bi_2 Sr_2 CaCu_2 O_{8+\delta}$   Recent angle-resolved photoemission and neutron scattering data have provided
new ingredients for the interpretation of scanning tunneling spectra on
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$. We analyze the low-temperature tunneling
spectra, from oxygen overdoped to underdoped samples, including details about
the bilayer splitting and the neutron resonance peak. Two van Hove
singularities are identified: the first is integrated in the coherence peaks,
the second is heavily broadened at higher binding energy. The shape of the
tunneling spectra suggests a strong coupling of the quasiparticles with a
collective mode, and a comparison with photoemission shows that the scattering
rate in tunneling is an order of magnitude smaller than in ARPES. Finally, the
theoretical spectra calculated with an isotropic tunneling matrix element are
in better agreement with the experimental data than those obtained with
anisotropic matrix elements.

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The categories of this paper are: hep-ex
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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: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-bio