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To understand the nematicity in Fe-based superconductors, nontrivial$k$-dependence of the orbital polarization ($\Delta E_{xz}(k)$, $\DeltaE_{yz}(k)$) in the nematic phase, such as the sign reversal of the orbitalsplitting between $\Gamma$- and X,Y-points in FeSe, provides significantinformation. To solve this problem, we study the spontaneous symmetry breakingwith respect to the orbital polarization and spin susceptibilityself-consistently. In FeSe, due to the sign-reversing orbital order, the hole-and electron-pockets are elongated along the $k_y$- and $k_x$-axesrespectively, consistently with experiments. In addition, an electron-pocketsplits into two Dirac cone Fermi pockets with increasing the orbitalpolarization. The orbital-order in Fe-based superconductors originates from thestrong positive feedback between the nematic orbital order and spinsusceptibility.

Sign-reversing orbital polarization in the nematic phase of FeSe due to the $C_2$ symmetry-breaking in the self-energy