Corrections to the self-consistent Born approximation for Weyl fermions
arXiv:1707.05595 · doi:10.1103/PhysRevB.96.165140
Abstract
The average density of states of two- and three-dimensional Weyl fermions is studied in the self-consistent Born approximation (SCBA) and its corrections. The latter have been organized in terms of a 1/N expansion. It turns out that an expansion in terms of the disorder strength is not applicable, as previously mentioned by other authors. Nevertheless, the 1/N expansion provides a justification of the SCBA as the large N limit of Weyl fermions.
12 pages, 4 figures, Phys. Rev. B (2017)