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We measure the electronic structure of FeSe from within individualorthorhombic domains. Enabled by an angle-resolved photoemission spectroscopybeamline with a highly focused beamspot (nano-ARPES), we identify clearstripe-like orthorhombic domains in FeSe with a length scale of approximately1-5~$\mu$m. Our photoemission measurements of the Fermi surface and bandstructure within individual domains reveal a single electron pocket at theBrillouin zone corner. This result provides clear evidence for a one-electronpocket electronic structure of FeSe, observed without the application ofuniaxial strain, and calls for further theoretical insight into this unusualFermi surface topology. Our results also showcase the potential of nano-ARPESfor the study of correlated materials with local domain structures.

Revealing the single electron pocket of FeSe in a single orthorhombic domain