| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Doping-enhanced robustness of anomaly-related magnetoresistance in WTe2±α flakes |
| Jianchao Meng(孟建超)1,2, Xinxiang Chen(陈鑫祥)1, Tingna Shao(邵婷娜)1, Mingrui Liu(刘明睿)3, Weimin Jiang(姜伟民)1, Zitao Zhang(张子涛)1, Changmin Xiong(熊昌民)1, Ruifen Dou(窦瑞芬)1,†, and Jiacai Nie(聂家财)1,‡ |
1 Department of Physics, Beijing Normal University, Beijing 100875, China;
2 College of Science, Inner Mongolia University of Technology, Hohhot 010051, China;
3 State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China |
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Abstract We study systematically the negative magnetoresistance ($MR$) effect in WTe$_{2\pm \alpha }$ flakes with different thicknesses and doping concentrations. The negative $MR$ is sensitive to the relative orientation between electrical-/magnetic-field and crystallographic orientation of WTe$_{2\pm \alpha }$. The analysis proves that the negative $MR$ originates from chiral anomaly and is anisotropic. Maximum entropy mobility spectrum is used to analyze the electron and hole concentrations in the flake samples. It is found that the negative $MR$ observed in WTe$_{2\pm \alpha }$ flakes with low doping concentration is small, and the high doping concentration is large. The doping-induced disorder obviously inhibits the positive $MR$, so the negative $MR$ can be more easily observed. In a word, we introduce disorder to suppress positive $MR$ by doping, and successfully obtain the negative $MR$ in WTe$_{2\pm \alpha }$ flakes with different thicknesses and doping concentrations, which indicates that the chiral anomaly effect in WTe$_{2}$ is robust.
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Received: 17 September 2022
Revised: 12 December 2022
Accepted manuscript online: 18 January 2023
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PACS:
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75.47.-m
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(Magnetotransport phenomena; materials for magnetotransport)
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61.46.-w
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(Structure of nanoscale materials)
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61.72.-y
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(Defects and impurities in crystals; microstructure)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 92065110, 11674031, 11974048, and 12074334) and the National Basic Research Program of China (Grant Nos. 2014CB920903 and 2013CB921701). |
Corresponding Authors:
Ruifen Dou, Jiacai Nie
E-mail: rfdou@bnu.edu.cn;jcnie@bnu.edu.cn
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Cite this article:
Jianchao Meng(孟建超), Xinxiang Chen(陈鑫祥), Tingna Shao(邵婷娜), Mingrui Liu(刘明睿), Weimin Jiang(姜伟民), Zitao Zhang(张子涛), Changmin Xiong(熊昌民), Ruifen Dou(窦瑞芬), and Jiacai Nie(聂家财) Doping-enhanced robustness of anomaly-related magnetoresistance in WTe2±α flakes 2023 Chin. Phys. B 32 047502
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