Field manipulation of Weyl modes in an ideal Dirac semimetal

Jingyuan Zhong, Jianfeng Wang (), Ming Yang, Jie Liu, Zhizhen Ren, Anping Huang, Zhixiang Shi, Zengwei Zhu, Yan Shi, Weichang Hao (), Jincheng Zhuang () and Yi Du ()
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Jingyuan Zhong: Beihang University, School of Physics
Jianfeng Wang: Beihang University, School of Physics
Ming Yang: Beihang University, School of Physics
Jie Liu: Huazhong University of Science and Technology, Wuhan National High Magnetic Field Center and School of Physics
Zhizhen Ren: Beihang University, School of Physics
Anping Huang: Beihang University, School of Physics
Zhixiang Shi: Southeast University, School of Physics and Key Laboratory of the Ministry of Education
Zengwei Zhu: Huazhong University of Science and Technology, Wuhan National High Magnetic Field Center and School of Physics
Yan Shi: Beihang University, School of Automation Science and Electrical Engineering
Weichang Hao: Beihang University, School of Physics
Jincheng Zhuang: Beihang University, School of Physics
Yi Du: Beihang University, School of Physics

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract The emergent Weyl modes with the broken time-reversal symmetry or inversion symmetry provide large Berry curvature and chirality to carriers, offering the realistic platforms to explore topology of electrons in three-dimensional systems. However, the reversal transition between different types of Weyl modes in a single material, which is of particular interest in the fundamental research in Weyl physics and potential application in spintronics, is scarcely achieved due to restriction of inborn symmetry in crystals. Here, by tuning the direction and strength of magnetic field in an ideal Dirac semimetal, Bi4(Br0.27I0.73)4, we report the realization of multiple Weyl modes, including gapped Weyl mode, Weyl nodal ring, and coupled Weyl mode by the magnetoresistivity measurements and electronic structure calculations. Specifically, under a magnetic field with broken mirror symmetry, anomalous Hall effect with step feature results from the large Berry curvature for the gapped Weyl mode. A prominent negative magnetoresistivity is observed at low magnetic field with preserved mirror symmetry and disappears at high magnetic field, which is correlated to the chiral anomaly and its annihilation of Weyl nodal ring, respectively. Our findings reveal distinct Weyl modes under the intertwined crystal symmetry and time-reversal breaking, laying the foundation of manipulating multiple Weyl modes in chiral spintronic network.

Date: 2025
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DOI: 10.1038/s41467-025-65832-7

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