Checkerboard superconducting order and antinodal Bogoliubov quasiparticle interference

TL;DR

This paper presents a numerical analysis of the momentum-dependent gap function in copper oxides, revealing how Fermi surface nesting leads to checkerboard superconducting order and unique quasiparticle interference patterns.

Contribution

It introduces a novel explanation for checkerboard superconducting order based on nesting-induced pairing with large momentum in copper oxides.

Findings

Nesting in the Fermi contour promotes large-momentum pairing.

Checkerboard pattern observed below Tc is linked to this pairing mechanism.

Predicted antinodal quasiparticle interference differs from nodal observations.

Abstract

Numerical study of momentum-dependent gap function is presented to make clear the origin of superconductivity in copper oxides. We claim that antinodal region with pronounced nesting feature of the Fermi contour gives rise to superconducting pairing with large momentum under screened Coulomb repulsion. Such a pairing results in both spatial checkerboard pattern of the superconducting state below Tc and a gapped state of incoherent pairs in a broad temperature range above Tc. We explain the momentum dependence of the coherent spectral weight detected in angle-resolved photoemission spectroscopy and predict antinodal Bogoliubov quasiparticle interference other than observed in the nodal region.