4.8 Article

Nature of Unconventional Pairing in the Kagome Superconductors AV3Sb5 (A = K, Rb, Cs)

Journal

PHYSICAL REVIEW LETTERS
Volume 127, Issue 17, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.177001

Keywords

-

Funding

  1. DeutscheForschungsgemeinschaft (DFG, German Research Foundation) [258499086-SFB 1170]
  2. WurzburgDresden Cluster of Excellence on Complexity and Topology in Quantum Matter [390858490-EXC 2147]
  3. Science and Engineering Research Board (SERB), Department of Science and Technology (DST), India [SRG/2019/000056]
  4. MATRICS [MTR/2019/001042]
  5. Abdus Salam International Centre for Theoretical Physics (ICTP) - Simons Foundation, IIT Madras [SB20210813PHMHRD002720]
  6. International Centre for Theoretical Sciences (ICTS), Bengaluru, India
  7. National Science Foundation [NSF PHY1748958]
  8. European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programm [ERC-StG-Neupert-757867-PARATOP]
  9. European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [897276]
  10. Gauss Centre for Supercomputing e.V. [55]

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The recent discovery of AV(3)Sb(5) has revealed an intriguing arena for exotic Fermi surface instabilities in a kagome metal, with superconductivity near multiple van Hove singularities showing indications of unconventional pairing. The sublattice interference mechanism is crucial in understanding the formation of superconductivity in a kagome metal, with nonlocal Coulomb repulsion, the sublattice profile of the van Hove bands, and the interaction strength being crucial parameters determining the preferred pairing symmetry. Implications for potentially topological surface states are discussed, along with a proposal for additional measurements to determine the nature of superconductivity in AV(3)Sb(5).
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).

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