# Single-orbital realization of high-temperature s± superconductivity in the square-octagon lattice

@article{Kang2019SingleorbitalRO,
title={Single-orbital realization of high-temperature
s±
superconductivity in the square-octagon lattice},
author={Yao-Tai Kang and Chen Lu and Fan Yang and Dao-Xin Yao},
journal={Physical Review B},
year={2019}
}
The remarkable $s\pm$ superconductivity (SC) is well known in the iron-based superconductors, which are of multi-orbital characteristic. Here we propose a single-orbital realization of this intriguing pairing state with high superconducting critical temperature $T_c$ in the square-octagon lattice, which is hosted by a few real materials. Owing to the perfect Fermi surface nesting at half-filling, arbitrarily weak Hubbard-interaction drives long-range spin-density wave (SDW) with Neel…
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## References

SHOWING 1-10 OF 100 REFERENCES
Magnetic correlations and pairing in the 1/5-depleted square lattice Hubbard model.
• Physics, Medicine
Physical review letters
• 2014
We study the single-orbital Hubbard model on the 1/5-depleted square-lattice geometry, which arises in such diverse systems as the spin-gap magnetic insulator CaV4O9 and ordered-vacancy iron
Chiral Spin Density Wave and d+id Superconductivity in the Magic-Angle-Twisted Bilayer Graphene.
• Physics, Medicine
Physical review letters
• 2018
It is found that chiral d+id topological superconductivity bordering the correlated insulating state near half-filling, identified as noncoplanar chiral spin-density wave ordered state, featuring the quantum anomalous Hall effect.
Possible triplet p + i p superconductivity in graphene at low filling
We study the Hubbard model on the honeycomb lattice with nearest-neighbor hopping ($t>0$) and next-nearest-neighbor one ($t'<0$). When $t'<-t/6$, the single-particle spectrum is featured by the
Near-degeneracy of several pairing channels in multiorbital models for the Fe pnictides
• Physics
• 2009
Weak-coupling approaches to the pairing problem in the iron pnictide superconductors have predicted a wide variety of superconducting ground states. We argue here that this is due both to the
Superconductivity from valley fluctuations and approximate SO(4) symmetry in a weak coupling theory of twisted bilayer graphene
• Physics
npj Quantum Materials
• 2019
AbstarctThe recent discovery of the Mott insulating and superconducting phases in twisted bilayer graphene has generated tremendous research interest. Here, we develop a weak coupling approach to the
Unconventional superconductivity in magic-angle graphene superlattices
The realization of intrinsic unconventional superconductivity is reported—which cannot be explained by weak electron–phonon interactions—in a two-dimensional superlattice created by stacking two sheets of graphene that are twisted relative to each other by a small angle.
Quantum magnetic phase transition in square-octagon lattice
• Physics, Medicine
Scientific reports
• 2014
The competition between the temperature and the on-site repulsive interaction in the isotropic square-octagon lattice has shown that both antiferromagnetic and paramagnetic order can be found not only in the metal phase, but also in the insulating phase.
d-wave pairing from spin fluctuations in the K x Fe 2-y Se 2 superconductors
• Physics
• 2011
Angle-resolved photoemission spectroscopy measurements on the recently discovered superconduc- tors in the KFe2Se2 family with critical temperatures up to - 33K suggest that no Fermi pockets of hole
A Novel Large Moment Antiferromagnetic Order in K 0.8 Fe 1.6 Se 2 Superconductor
The discovery of cuprate high TC superconductors has inspired the search for unconventional superconductors in magnetic materials. A successful recipe has been to suppress long-range order in a
Possible Electric-Field-Induced Superconducting States in Doped Silicene
• Li-Da Zhang, Fan Yang
• Materials Science, Physics
Scientific reports
• 2015
This study reveals that the electric field induces an interesting quantum phase transition from the singlet chiral d + id′-wave superconducting phase to the triplet f-wave one and will inject a new vitality to the familiar Si-based industry through adopting doped silicene as a tunable platform to study different types of exotic unconventional superconductivities.