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

Understand

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.