Enhanced conductance of Weyl semimetals with strain-induced chiral magnetic fields in the ultra-quantum limit

Magnetotransport is one of the key signatures of Weyl semimetals. It is believed to reveal the chiral anomaly, the nonconservation of chiral charge, by showing a large negative magnetoresistance for longitudinal transport. With the realization of chiral magnetic fields, fields that act with opposite sign on the two chiralities, transport experiments in presence of those fields come in sight. In this work, we show that the conductivity in the ultra-quantum regime of a disordered Weyl semimetal subjected to a chiral magnetic field in transport direction increases with the field strength and width of the sample. We relate this increment to the spatial separation of counterpropagating modes in those samples. Our results are based on tight-binding simulations and supported by analytical arguments. We argue how this effect can be used in devices that need spatial separation of charge carriers.