Control of Superconducting Correlations in High-Tc Cuprates

TL;DR

This paper proposes a method to enhance d-wave superconducting correlations in high-Tc cuprates by tuning the (pi,0) electronic level to the Fermi level, supported by numerical studies and experimental data analysis.

Contribution

It introduces a novel approach to control superconductivity in cuprates through band structure engineering based on many-body effects.

Findings

Superconducting pairing is enhanced when the (pi,0) level is near E_F.

The d-wave pairing interaction can be influenced by the (pi,0) level position.

Angle-resolved photoemission data supports the proposed mechanism.

Abstract

A strategy to enhance d-wave superconducting correlations is proposed based on our numerical study for correlated electron models for high-Tc cuprates. We observe that the pairing is enhanced when the single-electron level around (pi,0) is close to the Fermi level E_F, while the d-wave pairing interaction itself contains elements to disfavor the pairing due to shift of the (pi,0)-level. Angle-resolved photoemission results in the cuprates are consistently explained in the presence of the d-wave pairing interaction. Our proposal is the tuning of the (pi,0)-level under the many-body effects to E_F by optimal design of band structure.