Fig. 1.

A schematic illustration of the skin effect. The propagation of an electromagnetic wave entering a conductor is limited to a layer of width δ, called the skin depth. The skin depth changes with the frequency of the electric field ω, making it possible to probe different transport regimes in a single sample of a Weyl semimetal. To determine the effect of the chiral anomaly on transport, the sample is placed in an external magnetic field B aligned parallel to the propagating electric field.