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PtSe 2  is a recently discovered type-II Dirac semi-metal with heavily tilted Dirac cone in  z -direction of the momentum. Negative magnetoresistance (MR) is expected as a signature of the chiral anomaly in the  x – y  plane where Lorentz invariance is maintained. Here we report the observation of negative MR in PtSe 2  thin flakes with magnetic fields aligned parallel to the current path and crystal  a -axis. Systematic measurements reveal that this phenomenon is field-vector and temperature sensitive, thereby confirming chiral anomaly as its origin. Furthermore, the chiral anomaly is tunable with an electric field. Interestingly, negative MR vanishes along the orientation  a ′ perpendicular to  a -axis. This clear anisotropy is ascribed to the anisotropic distribution of the Fermi velocity. A weaker chiral anomaly is caused in  a ′ and therefore masked by the trivial background signal. Our results highlight the importance of even a small material anisotropy when studying the chiral magnetotransport of Weyl/Dirac semi-metals.

Asymmetric Fermi velocity induced chiral magnetotransport anisotropy in the type-II Dirac semi-metal PtSe2