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

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. Finally, 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.

Authors:
 [1];  [2];  [2]; ORCiD logo [1];  [3];  [1];  [2];  [2];  [4]; ORCiD logo [4];  [5]; ORCiD logo [4]; ORCiD logo [4];  [6];  [7];  [2]; ORCiD logo [2];  [3];  [4];  [8] more »; ORCiD logo [9];  [10]; ORCiD logo [11]; ORCiD logo [2];  [8] « less
  1. Peking Univ., Beijing (China)
  2. Princeton Univ., NJ (United States)
  3. Huazhong Univ. of Science and Technology, Wuhan (China)
  4. National Univ. of Singapore (Singapore). Centre for Advanced 2D Materials and Graphene Research Centre. Dept. of Physics
  5. Princeton Univ., NJ (United States); National Tsing Hua Univ., Hsinchu (Taiwan)
  6. National Tsing Hua Univ., Hsinchu (Taiwan); Academia Sinica, Taipei (Taiwan)
  7. Princeton Univ., NJ (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Condensed Matter and Magnet Science Group; Univ. of Central Florida, Orlando, FL (United States)
  8. Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  9. South Univ. of Science and Technology of China, Shenzhen (China)
  10. Univ. of Hong Kong (China). Dept. of Physics
  11. Princeton Univ., NJ (United States). Princeton Center for Theoretical Science
Publication Date:
Research Org.:
Princeton Univ., NJ (United States); Peking Univ., Beijing (China); National Univ. of Singapore (Singapore)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Basic Research Program of China; National Science Foundation of China; Singapore National Research Foundation
OSTI Identifier:
1259286
Alternate Identifier(s):
OSTI ID: 1356154
Report Number(s):
LA-UR-17-22175
Journal ID: ISSN 2041-1723; ncomms10735
Grant/Contract Number:
FG02-05ER46200; GBMF4547; 2013CB921901; 2014CB239302; PHMFF2015001; 1374020; RF-NRFF2013- 03
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Condensed-matter physics; Theoretical physics

Citation Formats

Zhang, Cheng-Long, Xu, Su-Yang, Belopolski, Ilya, Yuan, Zhujun, Lin, Ziquan, Tong, Bingbing, Bian, Guang, Alidoust, Nasser, Lee, Chi-Cheng, Huang, Shin-Ming, Chang, Tay-Rong, Chang, Guoqing, Hsu, Chuang-Han, Jeng, Horng-Tay, Neupane, Madhab, Sanchez, Daniel S., Zheng, Hao, Wang, Junfeng, Lin, Hsin, Zhang, Chi, Lu, Hai-Zhou, Shen, Shun-Qing, Neupert, Titus, Zahid Hasan, M., and Jia, Shuang. Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal. United States: N. p., 2016. Web. doi:10.1038/ncomms10735.
Zhang, Cheng-Long, Xu, Su-Yang, Belopolski, Ilya, Yuan, Zhujun, Lin, Ziquan, Tong, Bingbing, Bian, Guang, Alidoust, Nasser, Lee, Chi-Cheng, Huang, Shin-Ming, Chang, Tay-Rong, Chang, Guoqing, Hsu, Chuang-Han, Jeng, Horng-Tay, Neupane, Madhab, Sanchez, Daniel S., Zheng, Hao, Wang, Junfeng, Lin, Hsin, Zhang, Chi, Lu, Hai-Zhou, Shen, Shun-Qing, Neupert, Titus, Zahid Hasan, M., & Jia, Shuang. Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal. United States. doi:10.1038/ncomms10735.
Zhang, Cheng-Long, Xu, Su-Yang, Belopolski, Ilya, Yuan, Zhujun, Lin, Ziquan, Tong, Bingbing, Bian, Guang, Alidoust, Nasser, Lee, Chi-Cheng, Huang, Shin-Ming, Chang, Tay-Rong, Chang, Guoqing, Hsu, Chuang-Han, Jeng, Horng-Tay, Neupane, Madhab, Sanchez, Daniel S., Zheng, Hao, Wang, Junfeng, Lin, Hsin, Zhang, Chi, Lu, Hai-Zhou, Shen, Shun-Qing, Neupert, Titus, Zahid Hasan, M., and Jia, Shuang. Thu . "Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal". United States. doi:10.1038/ncomms10735. https://www.osti.gov/servlets/purl/1259286.
@article{osti_1259286,
title = {Signatures of the Adler–Bell–Jackiw chiral anomaly in a Weyl fermion semimetal},
author = {Zhang, Cheng-Long and Xu, Su-Yang and Belopolski, Ilya and Yuan, Zhujun and Lin, Ziquan and Tong, Bingbing and Bian, Guang and Alidoust, Nasser and Lee, Chi-Cheng and Huang, Shin-Ming and Chang, Tay-Rong and Chang, Guoqing and Hsu, Chuang-Han and Jeng, Horng-Tay and Neupane, Madhab and Sanchez, Daniel S. and Zheng, Hao and Wang, Junfeng and Lin, Hsin and Zhang, Chi and Lu, Hai-Zhou and Shen, Shun-Qing and Neupert, Titus and Zahid Hasan, M. and Jia, Shuang},
abstractNote = {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. Finally, 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.},
doi = {10.1038/ncomms10735},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {Thu Feb 25 00:00:00 EST 2016},
month = {Thu Feb 25 00:00:00 EST 2016}
}

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