S Schafroth et al 1997 J. Phys.: Condens. Matter 9 L111 doi:10.1088/0953-8984/9/9/001
Some global properties of the attractive Hubbard model in the superconducting phase: the T-matrix approximation in two dimensions
S Schafroth
, J J Rodríguez-Núñez
and H Beck§
LETTER TO THE EDITOR
We have applied the fast Fourier transform, which allows one 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 model below 
, extending previous calculations by the same authors. Using a constant order parameter 
, we calculated as a function of the electron density and interaction strength U. These global results deviate from the BCS behaviour remarkably.
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Issue 9 (3 March 1997)
Received 13 November 1996
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Some global properties of the attractive Hubbard model in the superconducting phase: the T-matrix approximation in two dimensions
S Schafroth et al 1997 J. Phys.: Condens. Matter 9 L111
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