  Various angle-dependent measurements in hole-doped cuprates suggested that
Non-Fermi liquid (NFL) and Fermi-liquid (FL) self-energies coexist in the
Brillouin zone. Moreover, it is also found that NFL self-energies survive up to
the overdoped region where the resistivity features a global FL-behavior. To
address this problem, here we compute the momentum dependent self-energy from a
single band Hubbard model. The self-energy is calculated self-consistently by
using a momentum-dependent density-fluctuation (MRDF) method. One of our main
result is that the computed self-energy exhibits a NFL-like frequency
dependence only in the antinodal region, and FL-like behavior elsewhere, and
retains its analytic form at all momenta and dopings. The dominant source of
NFL self-energy in the antinodal region stems from the self-energy-dressed
fluctuations between the itinerant and localized densities as self-consistency
is invoked. We also calculate the DC conductivity by including the full
momentum dependent self-energy. We find that the resistivity-temperature
exponent n becomes 1 near the optimal doping, while the NFL self-energy
occupies largest momentum-space volume. Surprisingly, even in the NFL state
near the optimal doping, the nodal region contains FL-like self-energies; while
in the under- and over-dopings (n ~ 2), the antinodal region remains NFL-like.
These results highlight the non-local correlation physics in cuprates and in
other similar intermediately correlated materials, where a direct link between
the microscopic single-particle spectral properties and the macroscopic
transport behavior can not be well established.
