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The work by Soares et al. Phys. Rev. B 65, 174506  (2002) investigates the BCS to Bose-Einstein crossoverfor d-wave pairing in the two-dimensional attractive Hubbard model. Contrary to their claims, we found that anonpairing region does not exist in the density vs coupling phase diagram. The gap parameter at T=0, asobtained by solving analytically as well as numerically the BCS equations, is in fact finite for any nonzerodensity and coupling, even in the weak-coupling regime

physical review. b, condensed matter

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