Abstract
We investigate spin-wave excitations in the spin-density wave state of doped iron pnictides within a five-orbital model. We find that the excitations along () → () are very sensitive to dopings whereas they do not exhibit a similar sensitivity along () → (). Secondly, the ellipticity of the elliptical ring-like excitations around () is also very much dependent on doping. Thirdly, the spin-wave spectral weight shifts towards the low-energy region as it moves away from zero doping. We find several features to be in qualitative agreement with the inelastic neutron-scattering measurements for the doped pnictides.
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