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We have studied the nature of the three-dimensional multi-band electronicstructure in the twodimensional triangular lattice Ir1-xPtxTe2 (x=0.05)superconductor using angle-resolved photoemission spectroscopy (ARPES), x-rayphotoemission spectroscopy (XPS) and band structure calculation. ARPES resultsclearly show a cylindrical (almost two-dimensional) Fermi surface around thezone center. Near the zone boundary, the cylindrical Fermi surface is truncatedinto several pieces in a complicated manner with strong three-dimensionality.The XPS result and the band structure calculation indicate that the strong Te5p-Te 5p hybridization between the IrTe2 triangular lattice layers isresponsible for the three-dimensionality of the Fermi surfaces and theintervening of the Fermi surfaces observed by ARPES.

Te 5p orbitals bring three-dimensional electronic structure to two-dimensional Ir0.95Pt0.05Te2