Bulk Fermi arc of disordered Dirac fermions in two dimensions

Michał Papaj, Hiroki Isobe, Liang Fu

Published 2018-02-01Version 1

We show that disordered Dirac fermion systems in two dimensions generally exhibit bulk Fermi arc replacing the Dirac point in the clean limit, provided that the Dirac fermion arises from two distinct orbitals unrelated by symmetry. This result is explicitly demonstrated in a disordered Dirac model that we introduce, where the disorder potential acts differently on the two orbitals and drives the system into a new strongly disordered phase.