Excitation spectrum of the two-dimensional attractive Hubbard model
Abstract
We calculate the one-particle spectral functions above the superconducting transition temperature
T
C
, in the framework of a functional integral approach. The coupling of the electronic self-energy to pair fluctuations, which are treated by means of a time-dependent Ginzburg-Landau equation, yields a double-peak structure, around the Fermi wavenumber. The peak separation is essentially temperature-independent, but the structure sharpens when
T
C
is approached.