Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: When low- and high-energy electronic responses meet in cuprate
  superconductors   The existence of coherent quasiparticles near the Fermi energy in the low
temperature state of high-temperature superconductors has been well established
by angle-resolved photoemission spectroscopy (ARPES). This technique directly
probes the momentum-resolved electronic excitation spectrum of the CuO$_2$
planes. We present a study of close to optimally doped
La$_{1.83}$Sr$_{0.17}$CuO$_4$ in the superconducting state and report an abrupt
change in the quasiparticle spectral function, as we follow the dispersion of
the ARPES signal from the Fermi energy up to 0.6 eV. The interruption in the
quasiparticle dispersion separates coherent quasiparticle peaks at low energies
from broad incoherent excitations at high energies. We find that the boundary
between these low-energy and high-energy features exhibits a cosine-shaped
momentum dependence, reminiscent of the superconducting d-wave gap. Further
intriguing similarities between characteristics of the incoherent excitations
and quasiparticle properties (lifetime, Fermi arcs) suggest a close relation
between the electronic response at high and low energies in cuprate
superconductors.

9
The categories of this paper are: nlin
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas