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Nature of Unconventional Pairing in the Kagome Superconductors $AV_3Sb_5 (A=K,Rb,Cs)$


Wu, Xianxin; Schwemmer, Tilman; Müller, Tobias; Consiglio, Armando; Sangiovanni, Giorgio; Di Sante, Domenico; Iqbal, Yasir; Hanke, Werner; Schnyder, Andreas P; Denner, M Michael; Fischer, Mark H; Neupert, Titus; Thomale, Ronny (2021). Nature of Unconventional Pairing in the Kagome Superconductors $AV_3Sb_5 (A=K,Rb,Cs)$. Physical Review Letters, 127(17):177001.

Abstract

The recent discovery of $AV_3Sb_5 (A=K,Rb,Cs)$ 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 $AV_3Sb_5$, 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 $AV_3Sb_5$.

Abstract

The recent discovery of $AV_3Sb_5 (A=K,Rb,Cs)$ 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 $AV_3Sb_5$, 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 $AV_3Sb_5$.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:19 October 2021
Deposited On:23 Dec 2021 05:35
Last Modified:28 Jan 2024 02:37
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevlett.127.177001
Project Information:
  • : FunderScience and Engineering Research Board
  • : Grant ID
  • : Project Title
  • : FunderAbdus Salam International Centre for Theoretical Physics
  • : Grant ID
  • : Project Title
  • : FunderSimons Foundation
  • : Grant ID
  • : Project Title
  • : FunderInternational Centre for Theoretical Sciences
  • : Grant ID
  • : Project Title
  • : FunderH2020
  • : Grant ID897276
  • : Project TitleBITMAP - aB-IniTio calculations and MAchine learning for suPerconducting collective phenomena in novel materials
  • Content: Published Version
  • Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)