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Butterfly-Like Anisotropic Magnetoresistance and Angle-Dependent Berry Phase in a Type-II Weyl Semimetal WP$_{2}$ |
| Kaixuan Zhang1†, Yongping Du2†, Pengdong Wang3, Laiming Wei1, Lin Li1, Qiang Zhang1, Wei Qin1, Zhiyong Lin1, Bin Cheng1, Yifan Wang1, Han Xu1, Xiaodong Fan1, Zhe Sun3,5, Xiangang Wan4,5*, and Changgan Zeng1* |
1International Center for Quantum Design of Functional Materials, Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Strongly Coupled Quantum Matter Physics, Department of Physics, and Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China, Hefei 230026, China
2Department of Applied Physics and Institution of Energy and Microstructure, Nanjing University of Science and Technology, Nanjing 210094, China
3National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
4National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
5Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
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| Cite this article: |
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Kaixuan Zhang, Yongping Du, Pengdong Wang et al 2020 Chin. Phys. Lett. 37 090301 |
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Abstract The Weyl semimetal has emerged as a new topologically nontrivial phase of matter, hosting low-energy excitations of massless Weyl fermions. Here, we present a comprehensive study of a type-II Weyl semimetal WP$_{2}$. Transport studies show a butterfly-like magnetoresistance at low temperature, reflecting the anisotropy of the electron Fermi surfaces. This four-lobed feature gradually evolves into a two-lobed variant with an increase in temperature, mainly due to the reduced relative contribution of electron Fermi surfaces compared to hole Fermi surfaces for magnetoresistance. Moreover, an angle-dependent Berry phase is also discovered, based on quantum oscillations, which is ascribed to the effective manipulation of extremal Fermi orbits by the magnetic field to feel nearby topological singularities in the momentum space. The revealed topological character and anisotropic Fermi surfaces of the WP$_{2}$ substantially enrich the physical properties of Weyl semimetals, and show great promises in terms of potential topological electronic and Fermitronic device applications.
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Received: 04 June 2020
Published: 01 September 2020
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| PACS: |
03.65.Vf
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(Phases: geometric; dynamic or topological)
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72.15.-v
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(Electronic conduction in metals and alloys)
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75.47.-m
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(Magnetotransport phenomena; materials for magnetotransport)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11974324, 11804326, U1832151, and 11674296), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDC07010000), the National Key Research and Development Program of China (Grant No. 2017YFA0403600), the Anhui Initiative in Quantum Information Technologies (Grant No. AHY170000), the Hefei Science Center CAS (Grant No. 2018HSC-UE014), the Jiangsu Provincial Science Foundation for Youth (Grant No. BK20170821), the National Natural Science Foundation of China for Youth (Grant No. 11804160), and the Anhui Provincial Natural Science Foundation (Grant No. 1708085MF136). |
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