Chiral charge conservation and ballistic magnetotransport in a disordered Weyl semimetal
Phys. Rev. B 112, 235162 – Published 23 December, 2025
DOI: https://doi.org/10.1103/ktxk-pnsf
Abstract
We demonstrate that in an ideal Weyl semimetal, in which the Fermi energy coincides with the band-touching nodes, weak direct internodal scattering is irrelevant and, as a result, the chiral charge is (almost) exactly conserved. This leads to an experimentally observable effect: in an applied magnetic field, the charge transport along the field becomes purely ballistic, with the conductance given by per magnetic flux quantum through the sample cross section. This is the strongest experimental manifestation of nontrivial topology in Weyl and Dirac semimetals.
