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

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arxiv 1503.01304 v1 pith:JSUBRKUU submitted 2015-03-04 cond-mat.mtrl-sci cond-mat.mes-hall

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

classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords weylanomalychiralsemi-metalfieldmagneto-resistancenegativepoints
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 1 Pith paper

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    hep-th 2026-02 conditional novelty 5.0

    A rotating D7-brane ansatz that switches on the Wess-Zumino term yields an anomaly-enhanced negative magnetoresistance in the D3/D7 model.