Magnetotransport in Weyl nanowires*

We study longitudinal magnetotransport in Weyl semimetal nanowires. We show that depending on radii of nanowires and magnetic field amplitudes there exist two qualitatively and quantitavely different regimes of transport. It is demonstrated that in the strong magnetic field regime (magnetic length much smaller than the radius of the nanowire), Landau level spectrum contains the chiral 0-th Landau level, and thus the transport properties resemble that of a bulk Weyl semimetal. On the contrary, in the weak magnetic field regime (magnetic length much larger than the radius of the nanowire), the lowest-energy band is a Fermi arc surface-bulk state with a non-chiral dispersion, hence there appear transport features distinct from those attained at larger radii or larger magnetic fields. We argue that both regimes are relevant for the ongoing experiments. We also demonstrate that the contribution of Fermi arc surface states is salient and, therefore, crucial for understanding transport properties of finite-size Weyl semimetal systems.