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Nat Commun. 2016 Feb 25;7:10735. doi: 10.1038/ncomms10735.

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

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International Center for Quantum Materials, School of Physics, Peking University, Beijing, China.
Laboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore.
Department of Physics, National University of Singapore, Singapore 117542, Singapore.
Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.
Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Department of Physics, University of Central Florida, Orlando, Florida 32816, USA.
Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
Department of Physics, South University of Science and Technology of China, Shenzhen, China.
Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
Princeton Center for Theoretical Science, Princeton University, Princeton, New Jersey 08544, USA.


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.

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