Superconducting pairing symmetry in the kagome-lattice Hubbard model

Abstract

The dominating superconducting pairing symmetry of the kagome-lattice Hubbard model is investigated using the determinant quantum Monte Carlo method. The superconducting instability occurs when doping the correlated insulators formed by the Hubbard interaction near the Dirac filling, and the superconducting state exhibits an electron-hole asymmetry. Among the pairing symmetries allowed, we demonstrate that the dominating channel is d-wave in the hole-doped case. This opens the possibility of condensation into an unconventional $d_{x^2-y^2}+i{d}_{xy}$ phase, which is characterized by an integer topological invariant and gapless edge states. In contrast, the $s^{\ast }$-wave channel, which has no change of sign in the pairing function, is favored by electron doping. We further find the dominating $s^{\ast }$-wave pairing persists up to the Van Hove singularity. The results are closely related to the recent experimental observations in kagome compounds AV3Sb5(A: K, Rb, Cs), and provide insight into the pairing mechanism of their superconducting states.

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Cited by in corpus (22)

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• Superconductivity from Orbital-Selective Electron-Phonon Coupling in $A{\mathrm{V}}_3{\mathrm{Sb}}_5$
• Sublattice modulated superconductivity in the Kagome Hubbard model
• Diagnosis of pairing symmetry by vortex and edge spectra in kagome superconductors
• Thermodynamic, magnetic and transport properties of the repulsive Hubbard model on the kagome lattice
• Electronic structure and spin-lattice relaxation in superconducting vortex states on the kagome lattice near van Hove filling
• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• Impact of the orbital current order on the superconducting properties of the kagome superconductors
• Interplay between Chiral Charge Density Wave and Superconductivity in Kagome Superconductors: A Self-consistent Theoretical Analysis
• Unconventional ferromagnetism and spin-triplet superconductivity in the imbalanced Kagome-lattice Hubbard model
• Effective minimal model and unconventional spin-singlet pairing in Kagome superconductor CsV3Sb5
• Probing the pairing symmetry in kagome superconductors based on the single-particle spectrum
• Observation of Fermi-surface-dependent anisotropic Cooper pairing in kagome superconductor CsV3Sb5
• Superconductivity and pair density waves from nearest-neighbor interactions in frustrated lattice geometries
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Impact of Charge Density Waves on Superconductivity and Topological Properties in AV${}_3$Sb${}_5$ Kagome Superconductors
• Charge-density wave fluctuation driven composite order in the layered Kagome Metals
• Fault-tolerant quantum simulation of generalized Hubbard models
• The possible frustrated superconductivity in the kagome superconductors
• Majorana edge states in s-wave kagome superconductors with Rashba interaction