Chiral superconducting phase and chiral spin-density-wave phase in a Hubbard model on the kagome lattice

Shun-Li Yu; Jian-Xin Li

doi:10.1103/PhysRevB.85.144402

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Chiral superconducting phase and chiral spin-density-wave phase in a Hubbard model on the kagome lattice

Shun-Li Yu, Jian-Xin Li

DOI 10.1103/PhysRevB.85.144402 · Physical Review B

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Abstract

We study the electronic instabilities of the Hubbard model in the 1/6 hole-doped Kagome lattice using the variational cluster approach. The 1/6 hole doping is unique in the sense that the Fermi level is at the van Hove singularity and the Fermi surface has a perfect nesting. In this case, a density wave is usually realized. However, we demonstrate here that the chiral dx2−y2+idxy superconducting state is most favorable when a small Hubbard interaction U (U<3.0t) is introduced, and a scalar chiral spin order is realized at large U (U>5.5t). Between them, a spin-disordered insulating state is proposed.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown