标题： 三维外尔半金属TaAs中手征异常引起的负磁阻观测 显示英文标题

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

摘要： 外尔半金属是石墨烯的三维类似物。 根据量子场论，费米能级附近的外尔点会出现与手征异常相关的新型输运现象。 在本文中，我们报告了在一种新预测的时光反演不变外尔半金属材料TaAs中，由手征异常产生的长期期待的负磁阻的第一个实验证据。 清晰 从非常弱的磁场开始就检测到了肖伯尼克-德哈斯振荡（SdH）。 对SdH峰的分析表明，沿回旋轨道积累的贝里相位为{\pi }，表明存在外尔点。 显示英文摘要

摘要： 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.