We present a polarization-resolved and temperature-dependent Raman scattering study of AFe2As2 (A = Ca, Eu). In the spin-density-wave (SDW) phase, spectral weight redistribution is observed in the fully symmetric and non-symmetric scattering channels at different energies. An anisotropic Raman response is observed in the fully symmetric channel in spontaneously detwinned CaFe2As2 samples. We calculate the orbital-resolved electronic structures using a combination of density functional theory and dynamical mean field theory (DFT+DMFT). We identify the electronic transitions corresponding to these two spectral features and find that the anisotropic Raman response originates from the lifted degeneracy of the dxz/yz orbitals in the broken symmetry phase.
@article{arxiv.1601.01942,
title = {Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 (A=Ca,Eu)},
author = {W. -L. Zhang and Z. P. Yin and A. Ignatov and Z. Bukowski and Janusz Karpinski and Athena S. Sefat and H. Ding and P. Richard and G. Blumberg},
journal= {arXiv preprint arXiv:1601.01942},
year = {2016}
}