Magnetic exchange induced Weyl state in a semimetal EuCd2Sb2
Hao Su,
Benchao Gong,
Wujun Shi,
Haifeng Yang,
Hongyuan Wang,
Wei Xia,
Zhenhai Yu,
Peng-Jie Guo,
Jinhua Wang,
Linchao Ding,
Liangcai Xu,
Xiaokang Li,
Xia Wang,
Zhiqiang Zou,
Na Yu,
Zengwei Zhu,
Yulin Chen,
Zhongkai Liu,
Kai Liu,
Gang Li,
Yanfeng Guo
Affiliations
Hao Su
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Benchao Gong
Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
Wujun Shi
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Haifeng Yang
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Hongyuan Wang
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Wei Xia
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Zhenhai Yu
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Peng-Jie Guo
Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
Jinhua Wang
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Linchao Ding
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Liangcai Xu
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Xiaokang Li
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Xia Wang
AnalyticalInstrumentation Center, School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Zhiqiang Zou
AnalyticalInstrumentation Center, School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Na Yu
AnalyticalInstrumentation Center, School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Zengwei Zhu
Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Yulin Chen
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Zhongkai Liu
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Kai Liu
Department of Physics and Beijing Key Laboratory of Opto-Electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
Gang Li
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Yanfeng Guo
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
Magnetic Weyl semimetals (WSMs) bearing long-time seeking are still very rare. We have identified herein that EuCd2Sb2, a semimetal belonging to the type IV magnetic space group, hosts a magnetic exchange induced Weyl state via performing high magnetic field magnetotransport measurements and ab initio calculations. In the A-type antiferromagnetic structure, the external field larger than 3.2 T can align all Eu spins to be fully polarized along the c-axis and consequently drive EuCd2Sb2 into a spin polarized state. Magnetotransport measurements up to ∼55–60 T showed striking Shubnikov-de Hass oscillations associated with a nontrivial Berry phase. The ab initio calculations unveiled a phase transition of EuCd2Sb2 from a small gap antiferromagnetic topological insulator to a spin polarized WSM in which the Weyl points emerge along the Γ-Z path. Fermi arcs on (100) and (010) surfaces are also predicted. Meanwhile, the observed large anomalous Hall effect indicates the existence of Weyl points around the Fermi level. The results pave a way toward the realization of various topological states in a single material through the magnetic exchange manipulation.
