  In this work we study the behavior of massless fermions in a graphene
wormhole and in the presence of an external magnetic field. The graphene
wormhole is made from two sheets of graphene that play the roles of
asymptotically flat spaces connected through a carbon nanotube with a zig-zag
boundary. We solve the massless Dirac equation in this geometry and analyze its
wave function. We show that the energy spectra of these solutions exhibit
similar behavior to Landau levels.
