TY - JOUR

T1 - Revisiting superconductivity in the extended one-band Hubbard model

T2 - Pairing via spin and charge fluctuations

AU - Roig, Merce

AU - Romer, Astrid T.

AU - Hirschfeld, P. J.

AU - Andersen, Brian M.

PY - 2022/12/30

Y1 - 2022/12/30

N2 - The leading superconducting instabilities of the two-dimensional extended repulsive one-band Hubbard model within spin-fluctuation pairing theory depend sensitively on electron density, band, and interaction parameters. We map out the phase diagrams within a random-phase-approximation spin-and charge-fluctuation approach, and find that while B1g (dx2-y2) and B2g (dxy) pairing dominates in the absence of repulsive longer-range Coulomb interactions VNN, the latter induces pairing in other symmetry channels, including, e.g., A2g (g-wave), nodal A1g (extended s-wave), or nodal Eu (p-wave) spin-triplet superconductivity. At the lowest temperatures, transition boundaries in the phase diagrams between symmetry-distinct spin-singlet orders generate complex time-reversal symmetry broken superpositions. By contrast, we find that boundaries between singlet and triplet regions are characterized by first-order transitions. Finally, motivated by recent photoemission experiments, we have determined the influence of an additional explicitly attractive nearest-neighbor interaction, VNN < 0, on the superconducting gap structure. Depending on the electronic filling, such an attraction boosts Eu (p-wave) spin-triplet or B1g (dx2-y2) spin-singlet ordering.

AB - The leading superconducting instabilities of the two-dimensional extended repulsive one-band Hubbard model within spin-fluctuation pairing theory depend sensitively on electron density, band, and interaction parameters. We map out the phase diagrams within a random-phase-approximation spin-and charge-fluctuation approach, and find that while B1g (dx2-y2) and B2g (dxy) pairing dominates in the absence of repulsive longer-range Coulomb interactions VNN, the latter induces pairing in other symmetry channels, including, e.g., A2g (g-wave), nodal A1g (extended s-wave), or nodal Eu (p-wave) spin-triplet superconductivity. At the lowest temperatures, transition boundaries in the phase diagrams between symmetry-distinct spin-singlet orders generate complex time-reversal symmetry broken superpositions. By contrast, we find that boundaries between singlet and triplet regions are characterized by first-order transitions. Finally, motivated by recent photoemission experiments, we have determined the influence of an additional explicitly attractive nearest-neighbor interaction, VNN < 0, on the superconducting gap structure. Depending on the electronic filling, such an attraction boosts Eu (p-wave) spin-triplet or B1g (dx2-y2) spin-singlet ordering.

KW - D-WAVE SUPERCONDUCTIVITY

KW - NEAR-NEIGHBOR ATTRACTION

KW - DENSITY-WAVE

KW - INSTABILITIES

KW - MECHANISM

U2 - 10.1103/PhysRevB.106.214530

DO - 10.1103/PhysRevB.106.214530

M3 - Journal article

VL - 106

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 21

M1 - 214530

ER -