Revisiting superconductivity in the extended one-band Hubbard model: Pairing via spin and charge fluctuations
Research output: Contribution to journal › Journal article › Research › peer-review
Standard
Revisiting superconductivity in the extended one-band Hubbard model : Pairing via spin and charge fluctuations. / Roig, Merce; Romer, Astrid T.; Hirschfeld, P. J.; Andersen, Brian M.
In: Physical Review B, Vol. 106, No. 21, 214530, 30.12.2022.Research output: Contribution to journal › Journal article › Research › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
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 -
ID: 337352186