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The pressure dependence of the structural ($T_s$), antiferromagnetic ($T_m$),and superconducting ($T_c$) transition temperatures in FeSe is investigated onthe basis of the 16-band $d$-$p$ model. At ambient pressure, a shallow holepocket disappears due to the correlation effect, as observed in theangular-resolved photoemission spectroscopy (ARPES) and quantum oscillation(QO) experiments, resulting in the suppression of the antiferromagnetic order,in contrast to the other iron pnictides. The orbital-polarization interactionbetween the Fe $d$ orbital and Se $p$ orbital is found to drive theferro-orbital order responsible for the structural transition withoutaccompanying the antiferromagnetic order. The pressure dependence of the Fermisurfaces is derived from the first-principles calculation and is found to wellaccount for the opposite pressure dependences of $T_s$ and $T_m$, around whichthe enhanced orbital and magnetic fluctuations cause the double-dome structureof the eigenvalue $\lambda$ in the Eliashberg equation, as consistent with thatof $T_c$ in FeSe.

Fermi surface, pressure-induced antiferromagnetic order, and superconductivity in FeSe