Rich nature of Van Hove singularities in Kagome superconductor CsV3Sb5

Yong Hu (), Xianxin Wu, Brenden R. Ortiz, Sailong Ju, Xinloong Han, Junzhang Ma, Nicholas C. Plumb, Milan Radovic, Ronny Thomale, Stephen D. Wilson, Andreas P. Schnyder () and Ming Shi ()
Additional contact information
Yong Hu: Paul Scherrer Institut
Xianxin Wu: Max-Planck-Institut für Festkörperforschung
Brenden R. Ortiz: University of California Santa Barbara
Sailong Ju: Paul Scherrer Institut
Xinloong Han: University of Hong Kong
Junzhang Ma: City University of Hong Kong
Nicholas C. Plumb: Paul Scherrer Institut
Milan Radovic: Paul Scherrer Institut
Ronny Thomale: University of Würzburg
Stephen D. Wilson: University of California Santa Barbara
Andreas P. Schnyder: Max-Planck-Institut für Festkörperforschung
Ming Shi: Paul Scherrer Institut

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract The recently discovered layered kagome metals AV3Sb5 (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 AV3Sb5.

Date: 2022
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DOI: 10.1038/s41467-022-29828-x

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