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

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.
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  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:
Report Number(s):
Journal ID: ISSN 2041-1723; ncomms10735
Grant/Contract Number:
FG02-05ER46200; GBMF4547; 2013CB921901; 2014CB239302; PHMFF2015001; 1374020; RF-NRFF2013- 03
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Nature Publishing Group
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
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Condensed-matter physics; Theoretical physics
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1356154