Some Global Properties of the Attractive Hubbard Model in the Superconducting Phase: T-Matrix Approximation in 2D
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 (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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