Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5

Kang, Mingu; Fang, Shiang; Kim, Jeong-Kyu; Ortiz, Brenden R.; Ryu, Sae Hee; Kim, Jimin; 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

doi:10.1038/s41567-021-01451-5

Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV₃Sb₅

Journal Article · Thu Jan 13 00:00:00 EST 2022 · Nature Physics

DOI:https://doi.org/10.1038/s41567-021-01451-5· OSTI ID:1892029

^[1]; ^[2]; Kim, Jeong-Kyu ^[3]; Ortiz, Brenden R. ^[4]; Ryu, Sae Hee ^[5]; Kim, Jimin ^[6]; Yoo, Jonggyu ^[3]; ^[7]; Di Sante, Domenico ^[8]; Park, Byeong-Gyu ^[9]; ^[5]; ^[5]; ^[5]; Kaxiras, Efthimios ^[10]; ^[4]; ^[3]; ^[11]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Max Planck POSTECH Korea Research Initiative, Pohang (Korea, Republic of)
Rutgers Univ., Piscataway, NJ (United States)
Max Planck POSTECH Korea Research Initiative, Pohang (Korea, Republic of); Pohang Univ. of Science and Technology (Korea, Republic of)
Univ. of California, Santa Barbara, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Inst. for Basic Science (IBS), Pohang (Korea, Republic of)
Univ. Würzburg (Germany)
Univ. of Bologna (Italy); Flatiron Institute, New York, NY (United States)
Pohang Univ. of Science and Technology (Korea, Republic of)
Harvard Univ., Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

The layered vanadium antimonides AV₃Sb₅ (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 AV₃Sb₅ 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. Furthermore, our work reveals the essential role of kagome-derived vHS for the collective phenomena realized in the AV₃Sb₅ family.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1892029

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 3 Vol. 18; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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