Crossover between electron-electron and electron-phonon mediated pairing on the Kagome lattice

Abstract

We study electron-electron and electron-phonon mediated pairing in the Holstein extended Hubbard model on the Kagome lattice near the van Hove fillings, and investigate their combined effects on electron pairing states. We find that their combination can promote exotic pairings in a crossover region, where the filling is close to a van Hove singularity. In particular, at the $p$-type van Hove filling the $E_{1u}$ ($p$-wave) and $B_{2u}$ ($f_{y^3-3y{x}^2}$-wave) pairings become leading, and at the $m$-type van Hove filling the $E_{1u}$ and $A_{2g}$ ($i$-wave) pairings get promoted. Moreover, we show that the electron-phonon interaction acquires a significant momentum dependence, due to the sublattice texture of the Fermi surfaces, which can promote non $s$-wave pairing. We present a detailed analysis of these pairing propensities and discuss implications for the vanadium-based kagome superconductors AV${}_3$Sb${}_5$.

15 pages, 16 figures

References in corpus (12)

• Non-Abelian Anyons and Topological Quantum Computation
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Superconductivity and normal-state properties of kagome metal RbV3Sb5 single crystals
• Topological surface states in nodal superconductors
• Highly-robust reentrant superconductivity in CsV3Sb5 under pressure
• Strong coupling nature of kagome superconductivity in LaRu${}_3$Si${}_2$
• Superconductivity from repulsive interactions on the kagome lattice
• d-wave superconductivity from electron-phonon interactions
• Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates

Cited by in corpus (7)

• The kagome Hubbard model from a functional renormalization group perspective
• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• Electronic orders on the kagome lattice at the lower Van Hove filling
• Exotic charge density waves and superconductivity on the Kagome Lattice
• Photoemission Insights to Electronic Orders in Kagome Superconductor AV3Sb5
• Calculated Unconventional Superconductivity via Charge Fluctuations in Kagome Metal CsV3Sb5
• Topological electron and phonon flat bands in novel kagome superconductor XPd5 (X=Ca, Sr, Ba)