Flat band separation and robust spin Berry curvature in bilayer kagome metals

Di Sante, Domenico; Bigi, Chiara; Eck, Philipp; Enzner, Stefan; Consiglio, Armando; Pokharel, Ganesh; Carrara, Pietro; Orgiani, Pasquale; Polewczyk, Vincent; Fujii, Jun; King, Phil D. C.; Vobornik, Ivana; Rossi, Giorgio; Zeljkovic, Ilija; Wilson, Stephen D.; Thomale, Ronny; Sangiovanni, Giorgio; Panaccione, Giancarlo; Mazzola, Federico

doi:10.1038/s41567-023-02053-z

Flat band separation and robust spin Berry curvature in bilayer kagome metals

Journal Article · Thu May 18 00:00:00 EDT 2023 · Nature Physics

DOI:https://doi.org/10.1038/s41567-023-02053-z· OSTI ID:1993973

^[1]; ^[2]; Eck, Philipp ^[3]; ^[3]; ^[3]; Pokharel, Ganesh ^[4]; ^[5]; ^[6]; Polewczyk, Vincent ^[6]; ^[7]; ^[2]; ^[7]; ^[5]; ^[8]; ^[4]; ^[3]; ^[3]; ^[7]; ^[9]

Univ. of Bologna (Italy); Flatiron Institute, New York, NY (United States); Boston College
Univ. of St. Andrews, Scotland (United Kingdom)
Univ. of Wurzburg (Germany)
Univ. of California, Santa Barbara, CA (United States)
Univ. degli Studi di Milano (Italy); Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy)
Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy). TASC Laboratory
Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy)
Boston College, Chestnut Hill, MA (United States)
Consiglio Nazionale delle Ricerche (CNR), Trieste (Italy); Ca' Foscari University of Venice (Italy)

Kagome materials have emerged as a setting for emergent electronic phenomena that encompass different aspects of symmetry and topology. It is debated whether the XV₆Sn₆ kagome family (where X is a rare-earth element), a recently discovered family of bilayer kagome metals, hosts a topologically non-trivial ground state resulting from the opening of spin–orbit coupling gaps. These states would carry a finite spin Berry curvature, and topological surface states. Here we investigate the spin and electronic structure of the XV₆Sn₆ kagome family. We obtain evidence for a finite spin Berry curvature contribution at the centre of the Brillouin zone, where the nearly flat band detaches from the dispersing Dirac band because of spin–orbit coupling. In addition, the spin Berry curvature is further investigated in the charge density wave regime of ScV₆Sn₆ and it is found to be robust against the onset of the temperature-driven ordered phase. Utilizing the sensitivity of angle-resolved photoemission spectroscopy to the spin and orbital angular momentum, our work unveils the spin Berry curvature of topological kagome metals and helps to define its spectroscopic fingerprint.

View Accepted Manuscript (DOE)

Research Organization:: Boston College, Chestnut Hill, MA (United States)

Sponsoring Organization:: European Union (EU); Gauss Centre for Supercomputing; German Research Foundation (DFG); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0020130

OSTI ID:: 1993973

Alternate ID(s):: OSTI ID: 2481102

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 8 Vol. 19; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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