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The electronic structure of the enigmatic iron-based superconductor FeSe haspuzzled researchers since spectroscopic probes failed to observe the expectedelectron pocket at the $Y$ point in the 1-Fe Brillouin zone. It has beenspeculated that this pocket, essential for an understanding of thesuperconducting state, is either absent or incoherent. Here, we perform atheoretical study of the preferred nematic order originating fromnearest-neighbor Coulomb interactions in an electronic model relevant for FeSe.We find that at low temperatures the dominating nematic components are ofinter-orbital $d_{xz}-d_{xy}$ and $d_{yz}-d_{xy}$ character, with spontaneouslybroken amplitudes for these two components. This inter-orbital nematic ordernaturally leads to distinct hybridization gaps at the $X$ and $Y$ points of the1-Fe Brillouin zone, and may thereby produce highly anisotropic Fermi surfaceswith only a single electron pocket at one of these momentum-space locations.The associated superconducting gap structure obtained with the generatedlow-energy electronic band structure from spin-fluctuation mediated pairingagrees well with that measured experimentally. Finally, from a comparison ofthe computed spin susceptibility to available neutron scattering data, wediscuss the necessity of additional self-energy effects, and explore the roleof orbital-dependent quasiparticle weights as a minimal means to include them.

Inter-orbital nematicity and the origin of a single electron Fermi pocket in FeSe