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We investigate Dirac fermions in the antifferomagnetic metallic state ofiron-based superconduc- tors. Deriving an effective Hamiltonian for Diracfermions, we reveal that there exist two Dirac cones carrying the samechirality, contrary to graphene, compensated by a Fermi surface with aquadratic energy dispersion as a consequence of a non-trivial topologicalproperty inherent in the band structure. We also find that the presence of theDirac fermions gives the difference of sign- change temperatures between theHall coefficient and the thermopower. This is consistent with availableexperimental data.

Topological and Transport Properties of Dirac Fermions in Antiferromagnetic Metallic Phase of Iron-Based Superconductors