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Observation of Negative Magnetoresistance and nontrivial $π$ Berrys phase in 3D Weyl semi-metal NbAs

We report the electric transport properties of NbAs, which is a Weyl semimetal candidate proposed by recent theoretical calculations and confirmed by recent angle-resolved photoemission spectroscopy (ARPES) data. We detected the long-anticipated negative magneto-resistance generated by the chiral anomaly in NbAs. Clear Shubnikov de Haas (SdH) oscillations 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 $π$, indicating the existence of Weyl points.

preprint2015arXivOpen access
Xiaojun YangYupeng LiZhen WangYi ZhenZhu-An Xu
cond-mat.supr-concond-mat.str-el
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Xiaojun YangYupeng LiZhen WangYi ZhenZhu-An Xu

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