Comment on "BCS to Bose-Einstein crossover phase diagram at zero temperature for a d(x2-y2) order parameter superconductor: Dependence on the tight-binding structure"

The work by Soares et al. Phys. Rev. B 65, 174506 (2002) investigates the BCS to Bose-Einstein crossover for d-wave pairing in the two-dimensional attractive Hubbard model. Contrary to their claims, we found that a nonpairing 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 nonzero density and coupling, even in the weak-coupling regime.



Titolo: Comment on "BCS to Bose-Einstein crossover phase diagram at zero temperature for a d(x2-y2) order parameter superconductor: Dependence on the tight-binding structure"
Autori: 
PERALI, Andrea
PIERI, Pierbiagio
CALVANESE STRINATI, Giancarlo
Data di pubblicazione: 2003
Rivista: 
PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS  
Abstract: The work by Soares et al. Phys. Rev. B 65, 174506 (2002) investigates the BCS to Bose-Einstein crossover for d-wave pairing in the two-dimensional attractive Hubbard model. Contrary to their claims, we found that a nonpairing 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 nonzero density and coupling, even in the weak-coupling regime.
Handle: http://hdl.handle.net/11581/116165
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