Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conserving approximation for the three-band Hubbard model: flat
  quasiparticle dispersion   It is shown that the low-energy single-particle excitation-spectrum of the
three-band Hubbard model at hole-dopings away from half-filling agrees
remarkably well with Quantum Monte Carlo data and spectroscopic experiments
within the framework of a conserving approximation that includes
self-consistently the interaction with charge, spin, and two-particle
fluctuations. The dispersion of the quasiparticle-peak obtained from the
spectral-weight function is flat around the $(\pi,0)$ and $(0,\pi)$ points as
has been observed in recent angle-resolved photoemission measurement. The
significant reduction of the quasiparticle-dispersion near the Fermi-energy is
due to spin-fluctuations, rather than being induced by band effects.

22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph