Fermion zero modes in a $Z_2$ vortex background
  In this paper we study the zero energy solutions of the Dirac equation in the background of a $Z_2$ vortex of a non-Abelian gauge model with three charged scalar fields. We determine the number of the fermionic zero modes giving their explicit form for two specific Ansatze. 
Gustavo Lozano, Azadeh Mohammadi, Fidel A. Schaposnik
hep-th cond-mat.mes-hall cond-mat.supr-con