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We report angle-resolved photoemission spectroscopy (ARPES) experimentsprobing deep into the hidden order (HO) state of URu2Si2, utilizing tunablephoton energies with sufficient energy and momentum resolution to detect thenear Fermi surface (FS) behavior. Our results reveal: (i) the full itinerancyof the 5f electrons; (ii) the crucial three-dimensional (3D) k-space nature ofthe FS and its critical nesting vectors, in good comparison withdensity-functional theory calculations, and (iii) the existence of hot-spotlines and pairing of states at the FS, leading to FS gapping in the HO phase.

Photoemission Imaging of 3D Fermi Surface Pairing at the Hidden Order Transition in URu2Si2