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Spin Berry curvature-enhanced orbital Zeeman effect in a kagome metal

Journal Article · · Nature Physics
 [1];  [1];  [2];  [3];  [4];  [5];  [3];  [2];  [6];  [1];  [1]
  1. Boston College, Chestnut Hill, MA (United States)
  2. University of California, Santa Barbara, CA (United States)
  3. Universität Würzburg (Germany)
  4. Synchrotron SOLEIL, Saint-Aubin (France)
  5. Istituto Officina dei Materiali, Trieste (Italy); Ca’ Foscari University of Venice (Italy)
  6. University of Bologna (Italy)
+ Show Author Affiliations
Berry phases and the related concept of Berry curvature can give rise to many unconventional phenomena in solids. Here, we discover a colossal orbital Zeeman effect of topological origin in a bilayer kagome metal, TbV6Sn6. Using spectroscopic imaging scanning tunnelling microscopy, we reveal that the magnetic field leads to a splitting of the gapped Dirac dispersion into two branches with enhanced momentum-dependent g factors, resulting in a substantial renormalization of the Dirac band. These measurements provide a direct observation of a magnetic field-controlled orbital Zeeman coupling to the orbital magnetic moments of up to 200 Bohr magnetons near the gapped Dirac points. Our work provides direct insight into the momentum-dependent nature of topological orbital moments and their tunability via the magnetic field, concomitant with the evolution of the spin Berry curvature. Furthermore, these results can be extended to explore large orbital magnetic moments driven by the Berry curvature governed by other quantum numbers beyond spin, such as the valley in certain graphene-based structures.
Research Organization:
Boston College, Chestnut Hill, MA (United States)
Sponsoring Organization:
Cottrell SEED; Marie Skłodowska-Curie; Q-AMASE-i programme; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
FG02-99ER45747; SC0020130
OSTI ID:
2480322
Alternate ID(s):
OSTI ID: 2329313
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 7 Vol. 20; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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