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We examine the optical conductivity in antiferromagnetic (AFM) iron pnictidesby mean-field calculation in a five-band Hubbard model. The calculated spectraare well consistent with the in-plane anisotropy observed in the measurements,where the optical conductivity along the direction with the AFM alignment ofneighboring spins is larger than that along the ferromagnetic (FM) direction inthe low-energy region; however, that along the FM direction becomes larger inthe higher-energy region. The difference between the two directions isexplained by taking account of orbital characters in both occupied andunoccupied states as well as of the nature of Dirac-type linear dispersionsnear the Fermi level.

Origin of In-Plane Anisotropy in Optical Conductivity for Antiferromagnetic Metallic Phase of Iron Pnictides