Gapless excitations inside the fully gapped kagome superconductors AV${}_3$Sb${}_5$

Abstract

The superconducting gap structures in the transition-metal-based kagome metal AV${}_3$Sb${}_5$ (A=K,Rb,Cs), the first family of quasi-two-dimensional kagome superconductors, remain elusive as there is strong experimental evidence for both nodal and nodaless gap structures. Here we show that the dichotomy can be resolved because of the coexistence of time-reversal symmetry breaking with a conventional fully gapped superconductivity. The symmetry protects the edge states which arise on the domains of the lattice symmetry breaking order to remain gapless in proximity to a conventional pairing. We demonstrate this result in a four-band tight-binding model using the V $d_{X^2-Y^2}$-like and the in-plane Sb $p_z$-like Wannier functions that can faithfully capture the main feature of the materials near the Fermi level.

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• Topological kagome magnets and superconductors
• Kagome superconductors AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Quantum states and intertwining phases in kagome materials
• Tunable nodal kagome superconductivity in charge ordered RbV3Sb5
• Nodeless electron pairing in CsV${}_3$Sb${}_5$-derived kagome superconductors
• Loop currents in $A$V${}_3$Sb${}_5$ kagome metals: multipolar and toroidal magnetic orders
• Crucial role of out-of-plane Sb-$p$ orbitals in Van Hove singularity formation and electronic correlation for superconducting Kagome metal CsV${}_3$Sb${}_5$
• Superconductivity from Orbital-Selective Electron-Phonon Coupling in $A{\mathrm{V}}_3{\mathrm{Sb}}_5$
• Tilted Dirac cones and topological transitions in strained kagome lattices
• Topological and nodal superconductor kagome magnesium triboride
• Electronic structure and spin-lattice relaxation in superconducting vortex states on the kagome lattice near van Hove filling
• Impact of the orbital current order on the superconducting properties of the kagome superconductors
• Non-degenerate surface pair density wave in the Kagome superconductor CsV${}_3$Sb${}_5$ -- application to vestigial orders
• Statistical learning of engineered topological phases in the kagome superlattice of AV${}_3$Sb${}_5$
• Interplay between Chiral Charge Density Wave and Superconductivity in Kagome Superconductors: A Self-consistent Theoretical Analysis
• Magnetism in AV3Sb5 (Cs, Rb, K): Origin and Consequences for the Strongly Correlated Phases
• Tuning electronic pairing by uniaxial strain in kagome lattices
• MPd5 kagome superconductors studied by density functional calculations
• Photoemission Insights to Electronic Orders in Kagome Superconductor AV3Sb5
• Titanium doped kagome superconductor CsV3-xTixSb5 and two distinct phases
• Constraints on the orbital flux phase in $A$V${}_3$Sb${}_5$ from polar Kerr effect
• Pairing correlation of the Kagome-lattice Hubbard model with the nearest-neighbor interaction
• Josephson diodes induced by the loop current states
• The possible frustrated superconductivity in the kagome superconductors
• Magnetic fluctuations near the Van Hove singularity in the kagome-lattice Hubbard model at finite doping