Anisotropic staggered magnetization in electron-doped Fe-based superconductors

Based upon a two-orbital model with competing collinear antiferromagnetism and $s\pm$ pairing superconductivity, the electronic structures are investigated by solving Bogoliubov-de Gennes equations. Our results for the optimally electron-doped compound exhibit the anisotropic staggered magnetization. The Fourier transformation of the staggered magnetization shows two uneven peaks at $Q_x=(\pi,0)$ and $Q_y=(0,\pi)$. The spatial variation of the s? pairing superconductivity and the electronic charge distribution show a checkerboard-like pattern with $C_2$ symmetry. Finally, in the calculation of the local density of states, we found that the anisotropic staggered magnetization does not open a gap. Our results are good in agreement with the recently reported experimental results.