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Kim, Ji Min
원자제어 저차원 전자계 연구단
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Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5

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Title
Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5
Author(s)
Kang, Mingu; Fang, Shiang; Kim, Jeong-Kyu; Ortiz, Brenden R.; Ryu, Sae Hee; Jimin Kim; Yoo, Jonggyu; Sangiovanni, Giorgio; Di Sante, Domenico; Park, Byeong-Gyu; Jozwiak, Chris; Bostwick, Aaron; Rotenberg, Eli; Kaxiras, Efthimios; Wilson, Stephen D.; Park, Jae-Hoon; Comin, Riccardo
Publication Date
2022-03
Journal
NATURE PHYSICS, v.18, no.3, pp.301 - 308
Publisher
NATURE PORTFOLIO
Abstract
Spectroscopic measurements show how the features of the band structure related to the kagome lattice in CsV3Sb5 contribute to the observed strongly correlated phases. The layered vanadium antimonides AV(3)Sb(5) (A = K, Rb, Cs) are a recently discovered family of topological kagome metals that exhibit a range of strongly correlated electronic phases including charge order and superconductivity. However, it is not yet understood how the distinctive electronic structure of the kagome lattice is linked to the observed many-body phenomena. Here we combine angle-resolved photoemission spectroscopy and density functional theory to reveal multiple kagome-derived van Hove singularities (vHS) coexisting near the Fermi level of CsV3Sb5 and analyse their contribution to electronic symmetry breaking. The vHS are characterized by two distinct sublattice flavours (p-type and m-type), which originate, respectively, from their pure and mixed sublattice characters. These twofold vHS flavours of the kagome lattice critically determine the pairing symmetry and unconventional ground states emerging in the AV(3)Sb(5) series. We establish that, among the multiple vHS in CsV3Sb5, the m-type vHS of the d(xz)/d(yz) kagome band and the p-type vHS of the d(xy)/d(x2-y2) kagome band are located very close to the Fermi level, setting the stage for electronic symmetry breaking. The former band is characterized by pronounced Fermi surface nesting, while the latter exhibits a higher-order vHS. Our work reveals the essential role of kagome-derived vHS for the collective phenomena realized in the AV(3)Sb(5) family.
URI
https://pr.ibs.re.kr/handle/8788114/11359
DOI
10.1038/s41567-021-01451-5
ISSN
1745-2473
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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