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Recently there has been a lot of interest in 3D Dirac semimetals (DSM), which exhibit robust Dirac phases in the bulk of the material. The chiral magnetic effect (CME), which originates from the Weyl cones, causes an E.B-dependent chiral charge polarization, which manifests itself as negative magnetoresistance.

We exploit the extended lifetime of this chirally polarized charge and study the CME in both local and non-local measurements on structured devices of mechanically exfoliated single crystalline flakes of DSM Bi_1-xSb_x with x ≈ 0.03. From the transport measurements on the non-local devices we find that the chiral charge relaxation time is over an order of magnitude larger than the transport lifetime.