Revealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal

Qianni Jiang, Johanna C. Palmstrom, John Singleton, Shalinee Chikara, David Graf, Chong Wang, Yue Shi, Paul Malinowski, Aaron Wang, Zhong Lin, Lingnan Shen, Xiaodong Xu, Di Xiao and Jiun-Haw Chu ()
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Qianni Jiang: University of Washington
Johanna C. Palmstrom: Los Alamos National Laboratory
John Singleton: Los Alamos National Laboratory
Shalinee Chikara: Florida State University
David Graf: Florida State University
Chong Wang: University of Washington
Yue Shi: University of Washington
Paul Malinowski: University of Washington
Aaron Wang: University of Washington
Zhong Lin: University of Washington
Lingnan Shen: University of Washington
Xiaodong Xu: University of Washington
Di Xiao: University of Washington
Jiun-Haw Chu: University of Washington

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract In type-II Weyl semimetals (WSMs), the tilting of the Weyl cones leads to the coexistence of electron and hole pockets that touch at the Weyl nodes. These electrons and holes experience the Berry curvature generated by the Weyl nodes, leading to an anomalous Hall effect that is highly sensitive to the Fermi level position. Here we have identified field-induced ferromagnetic MnBi2-xSbxTe4 as an ideal type-II WSM with a single pair of Weyl nodes. By employing a combination of quantum oscillations and high-field Hall measurements, we have resolved the evolution of Fermi-surface sections as the Fermi level is tuned across the charge neutrality point, precisely matching the band structure of an ideal type-II WSM. Furthermore, the anomalous Hall conductivity exhibits a heartbeat-like behavior as the Fermi level is tuned across the Weyl nodes, a feature of type-II WSMs that was long predicted by theory. Our work uncovers a large free carrier contribution to the anomalous Hall effect resulting from the unique interplay between the Fermi surface and diverging Berry curvature in magnetic type-II WSMs.

Date: 2024
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DOI: 10.1038/s41467-024-46633-w

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