Revealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal
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 MnBi 2-x Sb x Te 4 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.
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 2323963
- Resource Type:
- Published Article
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Name: Nature Communications Journal Volume: 15 Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Jiang, Qianni, Palmstrom, Johanna C., Singleton, John, Chikara, Shalinee, Graf, David, Wang, Chong, Shi, Yue, Malinowski, Paul, Wang, Aaron, Lin, Zhong, Shen, Lingnan, Xu, Xiaodong, Xiao, Di, and Chu, Jiun-Haw. Revealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal. United Kingdom: N. p., 2024.
Web. doi:10.1038/s41467-024-46633-w.
Jiang, Qianni, Palmstrom, Johanna C., Singleton, John, Chikara, Shalinee, Graf, David, Wang, Chong, Shi, Yue, Malinowski, Paul, Wang, Aaron, Lin, Zhong, Shen, Lingnan, Xu, Xiaodong, Xiao, Di, & Chu, Jiun-Haw. Revealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal. United Kingdom. https://doi.org/10.1038/s41467-024-46633-w
Jiang, Qianni, Palmstrom, Johanna C., Singleton, John, Chikara, Shalinee, Graf, David, Wang, Chong, Shi, Yue, Malinowski, Paul, Wang, Aaron, Lin, Zhong, Shen, Lingnan, Xu, Xiaodong, Xiao, Di, and Chu, Jiun-Haw. Thu .
"Revealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal". United Kingdom. https://doi.org/10.1038/s41467-024-46633-w.
@article{osti_2323963,
title = {Revealing Fermi surface evolution and Berry curvature in an ideal type-II Weyl semimetal},
author = {Jiang, Qianni and Palmstrom, Johanna C. and Singleton, John and Chikara, Shalinee and Graf, David and Wang, Chong and Shi, Yue and Malinowski, Paul and Wang, Aaron and Lin, Zhong and Shen, Lingnan and Xu, Xiaodong and Xiao, Di and Chu, Jiun-Haw},
abstractNote = {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 MnBi 2-x Sb x Te 4 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.},
doi = {10.1038/s41467-024-46633-w},
journal = {Nature Communications},
number = 1,
volume = 15,
place = {United Kingdom},
year = {Thu Mar 14 00:00:00 EDT 2024},
month = {Thu Mar 14 00:00:00 EDT 2024}
}
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