Control of superconducting correlations in high-T-c cuprates

A strategy to enhance d-wave superconducting correlations is proposed based on our numerical study of correlated electron models for high-T-c cuprates . We observe that the pairing is enhanced when the single-electron level ar ound (pi, 0) is close to the Fermi lever E-F, while the d-wave pairing inte raction itself contains elements to disfavor the pairing due to a shift of the (pi, 0)-level. Angle-resolved photoemission results for the cuprates ar e consistently explained in the presence of the d-wave pairing interaction. We propose to tune the (pi, 0)-level, under many-body effects, to E-F thro ugh optimal design of the band structure.