Mirror nesting of the Fermi contour and zero line of the superconducting order parameter

Checkerboard superconducting order and antinodal Bogoliubov quasiparticle interference

“…5 In this paper, we study the mean-field K-pairing problem numerically to fall outside the weak coupling limits employed in our previous approach to the K-pairing problem. 5,6,7 We show that the SC gap function with a nontrivial nodal line corresponds to a checkerboard pair density wave (PDW) SC state and results in fairly natural explanation of the angle dependence of a partial suppression of the coherent spectral weight in the antinodal region observed by Kondo et al 3 We believe that QPI, other than observed in the nodal region, 2 could be detected in the antinodal one as well. We also show that Kpairing can originate spatial checkerboard pattern without any driving insulating order in contrast to a scenario of a rise of PDW coexisting with a charge density wave (CDW).…”

“…Besides the fact that two-particle problem with oscillating potential leads to a bound state of the relative motion of K-pair, 6 it can also produce a quasistationary state (QSS) 7 similar to the Gamov's state of alpha-radioactive nucleus. 8 SC gap function ∆ sc (k), depending on relative-motion momentum k of K-pair, as a solution to the mean-field self-consistency equation, arises as a result of the instability of the ground state of the normal Fermi liquid with respect to a rise of K-pairs in the bound state.…”

Checkerboard superconducting order and antinodal Bogoliubov quasiparticle interference

“…5,6,7 We show that the SC gap function with a nontrivial nodal line corresponds to a checkerboard pair density wave (PDW) SC state and results in fairly natural explanation of the angle dependence of a partial suppression of the coherent spectral weight in the antinodal region observed by Kondo et al 3 We believe that QPI, other than observed in the nodal region, 2 could be detected in the antinodal one as well. We also show that Kpairing can originate spatial checkerboard pattern without any driving insulating order in contrast to a scenario of a rise of PDW coexisting with a charge density wave (CDW).…”

“…Besides the fact that two-particle problem with oscillating potential leads to a bound state of the relative motion of K-pair, 6 it can also produce a quasistationary state (QSS) 7 similar to the Gamov's state of alpha-radioactive nucleus.…”

“…6 We believe that the vicinities with energy scale ε 0 of the antinodal near rectilinear segments of the FC include electron states that mainly contribute to scattering resulting in K-pairing.…”