Fermiology, Orbital Order, Orbital Fluctuation and Cooper Pairing in Iron-based Superconductors

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We address two important issues that arise in recent studies of iron-based superconductivity. (1) Why are the Tc of AₓFe₂₋ySe₂ and the single unit cell FeSe on SrTiO₃ so high despite both only have electron pockets? (2) What (if any) are the effects of orbital order and orbital fluctuation on the Cooper pairing. Our conclusions are summarized in the third paragraph of the paper.