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Revisiting superconductivity in the extended one-band Hubbard model: Pairing via spin and charge fluctuations

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [4]
  1. University of Copenhagen (Denmark); U. Florida
  2. University of Copenhagen (Denmark); Danish Fundamental Metrology, Hørsholm (Denmark)
  3. University of Florida, Gainesville, FL (United States)
  4. University of Copenhagen (Denmark)
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. Furthermore, depending on the electronic filling, such an attraction boosts Eu (p-wave) spin-triplet or B1g (dx2–y2) spin-singlet ordering.
Research Organization:
University of Florida, Gainesville, FL (United States)
Sponsoring Organization:
Independent Research Fund Denmark; Novo Nordisk Foundation; USDOE
Grant/Contract Number:
FG02-05ER46236
OSTI ID:
1991755
Alternate ID(s):
OSTI ID: 1907196
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 21 Vol. 106; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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