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Bi$_{1-x}$Sb$_x$ is a topological insulator (TI) for $x \approx 0.03$--$0.20$. Close to the Topological phase transition at $x = 0.03$, a magneticfield induced Weyl semi-metal (WSM) state is stabilized due to the splitting ofthe Dirac cone into two Weyl cones of opposite chirality. A signature of theWeyl state is the observation of a Chiral anomaly [negative longitudnalmagnetoresistance (LMR)] and a violation of the Ohm's law (non-linear $I-V$).We report the unexpected discovery of a Chiral anomaly in the whole range ($x =0.032, 0.072, 0.16$) of the TI state. This points to a field induced WSM statein an extended $x$ range and not just near the topological transition at $x =0.03$. Surprisingly, the strongest Weyl phase is found at $x = 0.16$ with anon-saturating negative LMR much larger than observed for $x = 0.03$. Thenegative LMR vanishes rapidly with increasing angle between $B$ and $I$.Additionally, non-linear $I$--$V$ is found for $x = 0.16$ indicating aviolation of Ohm's law. This unexpected observation of a strong Weyl state inthe whole TI regime in Bi$_{1-x}$Sb$_x$ points to a gap in our understanding ofthe detailed electronic structure evolution in this alloy system.

Observation of Chiral character deep in the topological insulating regime in Bi$_{1-x}$Sb$_x$