期刊
PHYSICAL REVIEW X
卷 5, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.5.031023
关键词
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资金
- National Basic Research of China Program 973 [2015CB921303, 2011CBA00108, 2013CB921700]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB01020300, XDB07020100]
- National Natural Science Foundation of China
Weyl semimetal is the three-dimensional analog of graphene. According to 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 experimental evidence for the long-anticipated negative magnetoresistance generated by the chiral anomaly in a newly predicted time-reversal-invariant Weyl semimetal material TaAs. Clear Shubnikov de Haas (SdH) oscillations have been detected starting from a very weak magnetic field. Analysis of the SdH peaks gives the Berry phase accumulated along the cyclotron orbits as pi, indicating the existence of Weyl points.
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