Some Global Properties of the Attractive Hubbard Model in the Superconducting Phase: T-Matrix Approximation in 2D
S. Schafroth, J. J. Rodriguez, H. Beck
Abstract
We have applied the Fast Fourier transform (FFT), which allows to compute efficiently convolution sums, to solve the set of self-consistent T-matrix equations to get the Green function of the two dimensional attractive-U Hubbard modelbelow Tc, extending previous calculations of the same authors. Using a constant order parameter Δ(T), we calculated Tc as a function of electron density and interaction strength U. These global results deviate from the BCS behavior remarkably.
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