Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal

Cheng-Long Zhang, Su-Yang Xu, Ilya Belopolski, Zhujun Yuan, Ziquan Lin, Bingbing Tong, Guang Bian, Nasser Alidoust, Chi-Cheng Lee, Shin-Ming Huang, Tay-Rong Chang, Guoqing Chang, Chuang-Han Hsu, Horng-Tay Jeng, Madhab Neupane, Daniel S. Sanchez, Hao Zheng, Junfeng Wang, Hsin Lin, Chi Zhang, Hai-Zhou Lu, Shun-Qing Shen, Titus Neupert, M. Zahid Hasan () and Shuang Jia ()
Additional contact information
Cheng-Long Zhang: International Center for Quantum Materials, School of Physics, Peking University
Su-Yang Xu: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Ilya Belopolski: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Zhujun Yuan: International Center for Quantum Materials, School of Physics, Peking University
Ziquan Lin: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology
Bingbing Tong: International Center for Quantum Materials, School of Physics, Peking University
Guang Bian: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Nasser Alidoust: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Chi-Cheng Lee: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Shin-Ming Huang: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Tay-Rong Chang: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Guoqing Chang: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Chuang-Han Hsu: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Horng-Tay Jeng: National Tsing Hua University
Madhab Neupane: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Daniel S. Sanchez: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Hao Zheng: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Junfeng Wang: Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology
Hsin Lin: Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore
Chi Zhang: International Center for Quantum Materials, School of Physics, Peking University
Hai-Zhou Lu: South University of Science and Technology of China
Shun-Qing Shen: The University of Hong Kong
Titus Neupert: Princeton Center for Theoretical Science, Princeton University
M. Zahid Hasan: Laboratory for Topological Quantum Matter and Spectroscopy (B7), Princeton University
Shuang Jia: International Center for Quantum Materials, School of Physics, Peking University

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Weyl semimetals provide the realization of Weyl fermions in solid-state physics. Among all the physical phenomena that are enabled by Weyl semimetals, the chiral anomaly is the most unusual one. Here, we report signatures of the chiral anomaly in the magneto-transport measurements on the first Weyl semimetal TaAs. We show negative magnetoresistance under parallel electric and magnetic fields, that is, unlike most metals whose resistivity increases under an external magnetic field, we observe that our high mobility TaAs samples become more conductive as a magnetic field is applied along the direction of the current for certain ranges of the field strength. We present systematically detailed data and careful analyses, which allow us to exclude other possible origins of the observed negative magnetoresistance. Our transport data, corroborated by photoemission measurements, first-principles calculations and theoretical analyses, collectively demonstrate signatures of the Weyl fermion chiral anomaly in the magneto-transport of TaAs.

Date: 2016
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DOI: 10.1038/ncomms10735

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