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We study FeO, a Mott insulator in GGA and GGA+U approximations. In the GGA wefind a multi-band metallic state with remarkable inter-band nesting between two$t_{2g}$ bands of Fermi surface, which signals possible instability towards anorbital ordered insulating phase. Such broken symmetry state, although haslower energy than the underlying homogeneous metallic state, but the gapmagnitude is less than the experimentally observed optical gap. Therefore weincorporate the calculated value of on-site Coulomb repulsion U on orbitalordered state. We find that symmetry breaking and Coulomb correlationscooperate together to stabilize the system and give an insulating orbitalordered state, with the gap magnitude very close to the experimental value. Wepropose this method as a possible indication of orbital ordering in LDA and GGAcalculations. We check our method with known examples of LiVO$_2$ andLaMnO$_3$.

Fermi surface nesting and possibility of orbital ordering in FeO