  Angle-resolved photoemission spectromicroscopy on IrTe2 reveals evolution of
mesoscopic striped domains across its first order phase transition at about 280
K. The striped texture of the domains is characterized by a herringbone
arrangement of the electronic anisotropy axes. Under further cooling down to 47
K, the striped domains evolve into trijunction domains with the electronic
anisotropy in three directions. Each domain harbors quasi one-dimensional
surface bands forming Fermi arcs with peculiar spin polarization. The Fermi arc
corresponds to an edge state of the two-dimensional bulk electronic states
truncated at the surface, indicating an interesting interplay between the
symmetry breaking and the surface electronic states.
