4.8 Article

Rich nature of Van Hove singularities in Kagome superconductor CsV3Sb5

Journal

NATURE COMMUNICATIONS
Volume 13, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41467-022-29828-x

Keywords

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Funding

  1. Swiss National Science Foundation [200021-188413]
  2. NCCR MARVEL, a National Centre of Competence in Research - Swiss National Science Foundation [182892, DMR-1906325]
  3. NSF Materials Research Science and Engineering Center at UC Santa Barbara [DMR- 1720256]
  4. California NanoSystems Institute through the Elings Fellowship program
  5. National Natural Science Foundation of China [12104379]
  6. Guangdong Basic and Applied Basic Research Foundation [2021B1515130007]
  7. SNF [200021-182695]
  8. DeutscheForschungsgemeinschaft (DFG, German Research Foundation) [258499086 - SFB 1170, 390858490 - EXC 2147]

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Enhanced correlation effects due to multiple van Hove singularities (VHS) in the vicinity of the Fermi level are predicted in the recently discovered AV(3)Sb(5) kagome metals. This study identifies three VHSs with diverse sublattice characters in CsV3Sb5, and reveals the flat dispersion of one VHS, suggesting its higher-order nature. The insights into the electronic structure provided by this work serve as a solid starting point for understanding the intriguing correlation phenomena in the kagome metals AV(3)Sb(5).
Predictions suggest enhanced correlation effect due to multiple van Hove singularities (VHS) in the vicinity of the Fermi level in the recently discovered AV(3)Sb(5) kagome metals. Here the authors identify three VHSs close to the Fermi level with diverse sublattice characters in CsV3Sb5, and one of them shows flat dispersion suggesting the higher-order nature. The recently discovered layered kagome metals AV(3)Sb(5) (A = K, Rb, Cs) exhibit diverse correlated phenomena, which are intertwined with a topological electronic structure with multiple van Hove singularities (VHSs) in the vicinity of the Fermi level. As the VHSs with their large density of states enhance correlation effects, it is of crucial importance to determine their nature and properties. Here, we combine polarization-dependent angle-resolved photoemission spectroscopy with density functional theory to directly reveal the sublattice properties of 3d-orbital VHSs in CsV3Sb5. Four VHSs are identified around the M point and three of them are close to the Fermi level, with two having sublattice-pure and one sublattice-mixed nature. Remarkably, the VHS just below the Fermi level displays an extremely flat dispersion along MK, establishing the experimental discovery of higher-order VHS. The characteristic intensity modulation of Dirac cones around K further demonstrates the sublattice interference embedded in the kagome Fermiology. The crucial insights into the electronic structure, revealed by our work, provide a solid starting point for the understanding of the intriguing correlation phenomena in the kagome metals AV(3)Sb(5).

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