Klein tunneling and magnetoresistance of p-n junctions in Weyl semimetals

摘要

We study the zero temperature conductance and magnetoconductance of ballistic p-n junctions in Weyl semimetals. Electron transport is mediated by Klein tunneling between the n and p regions. The chiral anomaly that is realized in Weyl semimetals plays a crucial role in the magnetoconductance of the junction. With the exception of field orientations where the angle between B and the junction plane is small, magnetoconductance is positive and linear in B at both weak and strong magnetic fields. In contrast, magnetoconductance in conventional p-n junctions is always negative.