Synthesis of a semimetallic Weyl ferromagnet with point Fermi surface

Ilya Belopolski (), Ryota Watanabe, Yuki Sato, Ryutaro Yoshimi, Minoru Kawamura, Soma Nagahama, Yilin Zhao, Sen Shao, Yuanjun Jin, Yoshihiro Kato, Yoshihiro Okamura, Xiao-Xiao Zhang, Yukako Fujishiro, Youtarou Takahashi, Max Hirschberger, Atsushi Tsukazaki, Kei S. Takahashi, Ching-Kai Chiu, Guoqing Chang, Masashi Kawasaki, Naoto Nagaosa and Yoshinori Tokura ()
Additional contact information
Ilya Belopolski: RIKEN Center for Emergent Matter Science (CEMS)
Ryota Watanabe: University of Tokyo
Yuki Sato: RIKEN Center for Emergent Matter Science (CEMS)
Ryutaro Yoshimi: RIKEN Center for Emergent Matter Science (CEMS)
Minoru Kawamura: RIKEN Center for Emergent Matter Science (CEMS)
Soma Nagahama: University of Tokyo
Yilin Zhao: Nanyang Technological University
Sen Shao: Nanyang Technological University
Yuanjun Jin: Nanyang Technological University
Yoshihiro Kato: University of Tokyo
Yoshihiro Okamura: University of Tokyo
Xiao-Xiao Zhang: RIKEN Center for Emergent Matter Science (CEMS)
Yukako Fujishiro: RIKEN Center for Emergent Matter Science (CEMS)
Youtarou Takahashi: RIKEN Center for Emergent Matter Science (CEMS)
Max Hirschberger: RIKEN Center for Emergent Matter Science (CEMS)
Atsushi Tsukazaki: Tohoku University
Kei S. Takahashi: RIKEN Center for Emergent Matter Science (CEMS)
Ching-Kai Chiu: RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS)
Guoqing Chang: Nanyang Technological University
Masashi Kawasaki: RIKEN Center for Emergent Matter Science (CEMS)
Naoto Nagaosa: RIKEN Center for Emergent Matter Science (CEMS)
Yoshinori Tokura: RIKEN Center for Emergent Matter Science (CEMS)

Nature, 2025, vol. 637, issue 8048, 1078-1083

Abstract: Abstract Quantum materials governed by emergent topological fermions have become a cornerstone of physics. Dirac fermions in graphene form the basis for moiré quantum matter and Dirac fermions in magnetic topological insulators enabled the discovery of the quantum anomalous Hall (QAH) effect1–3. By contrast, there are few materials whose electromagnetic response is dominated by emergent Weyl fermions4–6. Nearly all known Weyl materials are overwhelmingly metallic and are largely governed by irrelevant, conventional electrons. Here we theoretically predict and experimentally observe a semimetallic Weyl ferromagnet in van der Waals (Cr,Bi)2Te3. In transport, we find a record bulk anomalous Hall angle of greater than 0.5 along with non-metallic conductivity, a regime that is strongly distinct from conventional ferromagnets. Together with symmetry analysis, our data suggest a semimetallic Fermi surface composed of two Weyl points, with a giant separation of more than 75% of the linear dimension of the bulk Brillouin zone, and no other electronic states. Using state-of-the-art crystal-synthesis techniques, we widely tune the electronic structure, allowing us to annihilate the Weyl state and visualize a unique topological phase diagram exhibiting broad Chern insulating, Weyl semimetallic and magnetic semiconducting regions. Our observation of a semimetallic Weyl ferromagnet offers an avenue towards new correlated states and nonlinear phenomena, as well as zero-magnetic-field Weyl spintronic and optical devices.

Date: 2025
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DOI: 10.1038/s41586-024-08330-y

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