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The field of topological materials science has recently been focussing onthree-dimensional Dirac semimetals, which exhibit robust Dirac phases in thebulk. However, the absence of characteristic surface states in accidental Diracsemimetals (DSM) makes it difficult to experimentally verify claims about thetopological nature using commonly used surface-sensitive techniques. The chiralmagnetic effect (CME), which originates from the Weyl nodes, causes an$\textbf{E}\cdot\textbf{B}$-dependent chiral charge polarization, whichmanifests itself as negative magnetoresistance. We exploit the extendedlifetime of the chirally polarized charge and study the CME through both localand non-local measurements in Hall bar structures fabricated from singlecrystalline flakes of the DSM Bi$_{0.97}$Sb$_{0.03}$. From the non-localmeasurement results we find a chiral charge relaxation time which is over oneorder of magnitude larger than the Drude transport lifetime, underlining thetopological nature of Bi$_{0.97}$Sb$_{0.03}$.

Non-local signatures of the chiral magnetic effect in Dirac semimetal Bi$_{0.97}$Sb$_{0.03}$