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We show that the complicated band reconstruction near Fermi surfaces in themagnetically ordered state of iron-pnictides observed by angle-resolvedphotoemission spectroscopies (ARPES) can be understood in a meanfield level ifthe \emph{intrinsic unit cell doubling} due to As atoms is properly consideredas shown in the recently constructed S$_{4}$ microscopic effective model. The(0,$\pi$) or ($\pi$,0) col-linear antiferromagnetic (C-AFM) order does not opengaps between two points at Fermi surfaces linked by the ordered wave vector butforces a band reconstruction involving four points in unfolded Brillouin zone(BZ) and gives rise to small pockets or hot spots. The S$_4$ symmetry naturallychooses a staggered orbital order over a ferro-orbital order to coexist withthe C-AFM order. These results strongly suggest that the kinematics based onthe S$_{4}$ symmetry captures the essential low energy physics of iron-basedsuperconductors.

europhysics letters

Oriented gap opening in the magnetically ordered state of  Iron-pnicitides: an impact of intrinsic unit cell doubling on the $Fe$ square  lattice by $As$ atoms