Single-orbital realization of high-temperature s± superconductivity in the square-octagon lattice
Yao-Tai Kang, Chen Lu, Fan Yang, Dao-Xin Yao
DOI 10.1103/PhysRevB.99.184506 · Physical Review B
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Abstract
We propose possible high-temperature superconductivity (SC) with singlet s±-wave pairing symmetry in the single-orbital Hubbard model on the square-octagon lattice with only nearest-neighbor hopping terms. Three different approaches are engaged to treat with the interacting model for different coupling strengths, which yield consistent results for the s± pairing symmetry. We propose octagraphene, i.e., a monolayer of carbon atoms arranged into this lattice, as a possible material realization of this model. Our variational Monte Carlo study for the material with realistic coupling strength yields a pairing strength comparable with the cuprates, implying a similar superconducting critical temperature between the two families. This study also applies to other materials with similar lattice structure.
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