Physics

Random phase approximation

Pairing

Van Hove singularity

Electron

Tight binding

Fermi surface

Condensed matter physics

Fermi level

Superconductivity

Quantum mechanics

Electronic structure

Coulomb

Physical Review Letters

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 van Hove singularities close to the Fermi level for AV_{3}Sb_{5}, we provide a random phase approximation analysis of superconducting instabilities. Nonlocal Coulomb repulsion, the sublattice profile of the van Hove bands, and the 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}.

Nature of Unconventional Pairing in the Kagome Superconductors <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Sb</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="…

Nature of Unconventional Pairing in the Kagome Superconductors AV3Sb5 ( Xianxin Wu33, Tilman Schwemmer8, ..., Ronny Thomale60View all 13 authors

Nature of Unconventional Pairing in the Kagome Superconductors AV3Sb5 (
Xianxin Wu
33
,
Tilman Schwemmer
8
,
..., Ronny Thomale
60