Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Three interaction energy scales in single-layer high-T$_C$ cuprate
  HgBa$_2$CuO$_{4+\delta}$   The lamellar cuprate superconductors exhibit the highest ambient-pressure
superconducting transition temperatures (T$_C$) and, after more than three
decades of extraordinary research activity, continue to pose formidable
scientific challenges. A major experimental obstacle has been to distinguish
universal phenomena from materials- or technique-dependent ones. Angle-resolved
photoemission spectroscopy (ARPES) measures momentum-dependent single-particle
electronic excitations and has been invaluable in the endeavor to determine the
anisotropic momentum-space properties of the cuprates. HgBa$_2$CuO$_{4+\delta}$
(Hg1201) is a single-CuO$_2$-layer cuprate with a particularly high optimal
T$_C$ and a simple crystal structure; yet there exists little information from
ARPES about the electronic properties of this model system. Here we present an
ARPES study of doping-, temperature-, and momentum-dependent systematics of
near-nodal dispersion anomalies in Hg1201. The data reveal a hierarchy of three
distinct energy scales -a sub-gap low-energy kink, an intermediate-energy kink
near 55 meV, and a peak-dip-hump structure. The first two features are
attributed to the coupling of electrons to Ba-derived optical phonons and
in-plane bond-stretching phonons, respectively. The nodal peak-dip-hump
structure appears to have a common doping-dependence in several single-layer
cuprates, and is interpreted as a manifestation of pseudogap physics at the
node. These results establish several universal phenomena, both in terms of
connecting multiple experimental techniques for a single material, and in terms
of connecting comparable spectral features in multiple structurally similar
cuprates.

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The categories of this paper are: adap-org
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
33
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: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: cs
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The categories of this paper are: math