Comment on ``BCS to Bose-Einstein crossover phase diagram at zero temperature for a d_{x^2-y^2} order parameter superconductor: Dependence on the tight-binding structure''
Superconductivity
2009-11-07 v1 Strongly Correlated Electrons
Abstract
The work by Soares et al. [Phys. Rev. B 65, 174506 (2002)] investigates the BCS-BE crossover for d-wave pairing in the 2-dimensional attractive Hubbard model. Contrary to their claims, we found that a non-pairing region does not exist in the density vs coupling phase diagram. The gap parameter at T=0, as obtained by solving analytically as well as numerically the BCS equations, is in fact finite for any non-zero density and coupling, even in the weak-coupling regime.
Cite
@article{arxiv.cond-mat/0211132,
title = {Comment on ``BCS to Bose-Einstein crossover phase diagram at zero temperature for a d_{x^2-y^2} order parameter superconductor: Dependence on the tight-binding structure''},
author = {A. Perali and P. Pieri and G. C. Strinati},
journal= {arXiv preprint arXiv:cond-mat/0211132},
year = {2009}
}
Comments
7 pages, 1 figure