Revisiting superconductivity in the extended one-band Hubbard model: Pairing via spin and charge fluctuations
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Dokumenter
- PhysRevB.106.214530
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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.
Originalsprog | Engelsk |
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Artikelnummer | 214530 |
Tidsskrift | Physical Review B |
Vol/bind | 106 |
Udgave nummer | 21 |
Antal sider | 11 |
ISSN | 2469-9950 |
DOI | |
Status | Udgivet - 30 dec. 2022 |
Links
- https://arxiv.org/pdf/2211.07423.pdf
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