Giant negative magnetoresistance induced by the chiral anomaly in individual Cd(3)As(2) nanowires

Dirac electronic materials beyond graphene and topological insulators have recently attracted considerable attention. Cd(3)As(2) is a Dirac semimetal with linear dispersion along all three momentum directions and can be viewed as a three-dimensional analogue of graphene. By breaking of either time-reversal symmetry or spatial inversion symmetry, the Dirac semimetal is believed to transform into a Weyl semimetal with an exotic chiral anomaly effect, however the experimental evidence of the chiral anomaly is still missing in Cd(3)As(2). Here we show a large negative magnetoresistance with magnitude of −63% at 60 K and −11% at 300 K in individual Cd(3)As(2) nanowires. The negative magnetoresistance can be modulated by gate voltage and temperature through tuning the density of chiral states at the Fermi level and the inter-valley scatterings between Weyl nodes. The results give evidence of the chiral anomaly effect and are valuable for understanding the Weyl fermions in Dirac semimetals.