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We present a polarization-resolved and temperature-dependent Raman scatteringstudy of AFe2As2 (A = Ca, Eu). In the spin-density-wave (SDW) phase, spectralweight redistribution is observed in the fully symmetric and non-symmetricscattering channels at different energies. An anisotropic Raman response isobserved in the fully symmetric channel in spontaneously detwinned CaFe2As2samples. We calculate the orbital-resolved electronic structures using acombination of density functional theory and dynamical mean field theory(DFT+DMFT). We identify the electronic transitions corresponding to these twospectral features and find that the anisotropic Raman response originates fromthe lifted degeneracy of the dxz/yz orbitals in the broken symmetry phase.

Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 (A=Ca,Eu)