Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs

Weyl semi-metal is the three dimensional analog of graphene. According to the quantum field theory, the appearance of Weyl points near the Fermi level will cause novel transport phenomena related to chiral anomaly. In the present paper, we report the first experimental evidence for the long-anticipa...

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Bibliographic Details
Published in:arXiv.org 2015-03
Main Authors: Huang, Xiaochun, Zhao, Lingxiao, Long, Yujia, Wang, Peipei, Chen, Dong, Yang, Zhanhai, Liang, Hui, Xue, Mianqi, Weng, Hongming, Zhong Fang, Dai, Xi, Chen, Genfu
Format: Article
Language:English
Subjects:
Cyclotrons
Field theory
Graphene
Quantum field theory
Quantum mechanics
Quantum theory
Transport phenomena
Online Access:Get full text
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Summary:Weyl semi-metal is the three dimensional analog of graphene. According to the quantum field theory, the appearance of Weyl points near the Fermi level will cause novel transport phenomena related to chiral anomaly. In the present paper, we report the first experimental evidence for the long-anticipated negative magneto-resistance generated by the chiral anomaly in a newly predicted time-reversal invariant Weyl semi-metal material TaAs. Clear Shubnikov de Haas oscillations (SdH) have been detected starting from very weak magnetic field. Analysis of the SdH peaks gives the Berry phase accumulated along the cyclotron orbits to be {\pi}, indicating the existence of Weyl points.
ISSN:2331-8422
DOI:10.48550/arxiv.1503.01304