Nature of unconventional pairing in the kagome superconductors AV${}_3$Sb${}_5$

Abstract

The recent discovery of AV${}_3$Sb${}_5$ (A=K,Rb,Cs) has uncovered an intriguing arena for exotic Fermi surface instabilities in a kagome metal. Among them, superconductivity is found in the vicinity of multiple van Hove singularities, exhibiting indications of unconventional pairing. We show that the sublattice interference mechanism is central to understanding the formation of superconductivity in a kagome metal. Starting from an appropriately chosen minimal tight-binding model with multiple with multiple van Hove singularities close to the Fermi level for AV${}_3$Sb${}_5$, we provide a random phase approximation analysis of superconducting instabilities. Non-local Coulomb repulsion, the sublattice profile of the van Hove bands, and the bare interaction strength turn out to be the crucial parameters to determine the preferred pairing symmetry. Implications for potentially topological surface states are discussed, along with a proposal for additional measurements to pin down the nature of superconductivity in AV${}_3$Sb${}_5$.

6 page, 4 figures

References in corpus (24)

• 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
• Discovery of a quantum limit Chern magnet TbMn6Sn6
• Unconventional Fermi surface instabilities in the Kagome Hubbard Model
• Charge density waves and electronic properties of superconducting kagome metals
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Double superconducting dome and triple enhancement of Tc in the kagome superconductor CsV3Sb5 under high pressure
• Superconductivity and normal-state properties of kagome metal RbV3Sb5 single crystals
• Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb,Cs)
• Chiral flux phase in the Kagome superconductor AV${}_3$Sb${}_5$
• Non-Abelian Topological Orders and Majorana Fermions in Spin-Singlet Superconductors
• Density waves and Cooper pairing on the honeycomb lattice
• Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in kagome metals ${\text{AV}}_3{\text{Sb}}_5$
• Theoretical prediction of a strongly correlated Dirac metal
• Pressure-induced Reemergence of Superconductivity in Topological Kagome Metal CsV3Sb5
• Interplay between charge order and superconductivity in the kagome metal KV${}_3$Sb${}_5$
• Nodeless superconductivity in the kagome metal CsV${}_3$Sb${}_5$
• Highly-robust reentrant superconductivity in CsV3Sb5 under pressure
• Absence of local moments in the kagome metal KV3Sb5 as determined by muon spin spectroscopy
• Pairing symmetry in a two-orbital Hubbard model on a square lattice
• Electronic correlations in the normal state of kagome superconductor KV${}_3$Sb${}_5$
• Nodal superconductivity and superconducting domes in the topological Kagome metal CsV3Sb5
• Kinetic ferromagnetism on a kagome lattice
• Spectroscopic signatures of time-reversal symmetry breaking superconductivity

Cited by in corpus (173)

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• Electronic Nature of Charge Density Wave and Electron-Phonon Coupling in Kagome Superconductor KV${}_3$Sb${}_5$
• Rich Nature of Van Hove Singularities in Kagome Superconductor CsV${}_3$Sb${}_5$
• Kagome superconductors AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Twofold symmetry of $c$-axis resistivity in topological kagome superconductor CsV${}_3$Sb${}_5$ with in-plane rotating magnetic field
• Quantum states and intertwining phases in kagome materials
• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Tunable nodal kagome superconductivity in charge ordered RbV3Sb5
• Emergence of new van Hove singularities in the charge density wave state of a topological kagome metal RbV3Sb5
• Charge-order-assisted topological surface states and flat bands in the kagome superconductor CsV${}_3$Sb${}_5$
• Nodeless electron pairing in CsV${}_3$Sb${}_5$-derived kagome superconductors
• Mechanism of exotic density-wave and beyond-Migdal unconventional superconductivity in kagome metal AV3Sb5 (A=K, Rb, Cs)
• Competition of superconductivity and charge density wave in selective oxidized CsV3Sb5 thin flakes
• Microscopic evidence for anisotropic multigap superconductivity in the CsV${}_3$Sb${}_5$ kagome superconductor
• Superconducting diode effect and interference patterns in Kagome CsV3Sb5
• Charge order landscape and competition with superconductivity in kagome metals
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• Bulk evidence of anisotropic $s$-wave pairing with no sign change in the kagome superconductor CsV${}_3$Sb${}_5$
• Chiral excitonic order from twofold van Hove singularities in kagome metals
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• Superconductivity from repulsive interactions on the kagome lattice
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• First-principles study on the double-dome superconductivities in kagome material CsV${}_3$Sb${}_5$ under pressure
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• Dynamical Study of the Origin of the Charge Density Wave in $A$V${}_3$Sb${}_5$ ($A=$K, Rb, Cs) Compounds
• Evolution of electronic structure in pristine and hole-doped kagome metal RbV${}_3$Sb${}_5$
• Spectroscopic Evidence for a Three-Dimensional Charge Density Wave in Kagome Superconductor CsV${}_3$Sb${}_5$
• Intertwined van-Hove Singularities as a Mechanism for Loop Current Order in Kagome Metals
• Van Hove tuning of AV3Sb5 kagome metals under pressure and strain
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• Intrinsic first and higher-order topological superconductivity in a doped topological insulator
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• Flat-Band Enhanced Antiferromagnetic Fluctuations and Superconductivity in Pressurized CsCr${}_3$Sb${}_5$
• Discovery of two families of VSb-based compounds with V-kagome lattice
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• Unconventional gapping behavior in a kagome superconductor
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• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
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• Impact of the orbital current order on the superconducting properties of the kagome superconductors
• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Tunable interface states between Floquet-Weyl semimetals
• Interplay between Chiral Charge Density Wave and Superconductivity in Kagome Superconductors: A Self-consistent Theoretical Analysis
• Enhancement of the superconductivity and quantum metallic state in the thin film of superconducting Kagome metal KV${}_3$Sb${}_5$
• Unconventional ferromagnetism and spin-triplet superconductivity in the imbalanced Kagome-lattice Hubbard model
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• Probing the pairing symmetry in kagome superconductors based on the single-particle spectrum
• Topological electronic structure and electronic nematicity in candidate kagome superconductors, ATi${}_3$Bi${}_5$ (A = Rb, Cs)
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• Observation of Fermi-surface-dependent anisotropic Cooper pairing in kagome superconductor CsV3Sb5
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• Impact of Charge Density Waves on Superconductivity and Topological Properties in AV${}_3$Sb${}_5$ Kagome Superconductors
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• Flat Topological Nodal Lines in Heavy-Fermion Compound CeCoGe${}_3$
• Microscopic origin of period-four stripe charge-density-wave in kagome metal CsV${}_3$Sb${}_5$
• High-throughput study of kagome compounds in the AV3Sb5 family
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