  We measure the electronic structure of FeSe from within individual
orthorhombic domains. Enabled by an angle-resolved photoemission spectroscopy
beamline with a highly focused beamspot (nano-ARPES), we identify clear
stripe-like orthorhombic domains in FeSe with a length scale of approximately
1-5~$\mu$m. Our photoemission measurements of the Fermi surface and band
structure within individual domains reveal a single electron pocket at the
Brillouin zone corner. This result provides clear evidence for a one-electron
pocket electronic structure of FeSe, observed without the application of
uniaxial strain, and calls for further theoretical insight into this unusual
Fermi surface topology. Our results also showcase the potential of nano-ARPES
for the study of correlated materials with local domain structures.
