Title: Anomalous electron spectrum and its relation to peak structure of electron scattering rate in cuprate superconductors,
Abstract: The recent discovery of a direct link between the sharp peak in the electron
quasiparticle scattering rate of cuprate superconductors and the well-known
peak-dip-hump structure in the electron quasiparticle excitation spectrum is
calling for an explanation. Within the framework of the kinetic-energy driven
superconducting mechanism, the complicated line-shape in the electron
quasiparticle excitation spectrum of cuprate superconductors is investigated.
It is shown that the interaction between electrons by the exchange of spin
excitations generates a notable peak structure in the electron quasiparticle
scattering rate around the antinodal and nodal regions. However, this peak
structure disappears at the hot spots, which leads to that the striking
peak-dip-hump structure is developed around the antinodal and nodal regions,
and vanishes at the hot spots. The theory also confirms that the sharp peak
observed in the electron quasiparticle scattering rate is directly responsible
for the remarkable peak-dip-hump structure in the electron quasiparticle
excitation spectrum of cuprate superconductors.