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We report an angle-resolved photoemission spectroscopy (ARPES) study on atriangular lattice superconductor Ir$_{1-x}$Pt$_{x}$Te$_2$ in which the Ir-Iror Te-Te bond formation, the band Jahn-Teller effect, and the spin-orbitinteraction are cooperating and competing with one another. The Fermi surfacesof the substituted system are qualitatively similar to the band structurecalculations for the undistorted IrTe$_2$ with an upward chemical potentialshift due to electron doping. A combination of the ARPES and the band structurecalculations indicates that the Te $5p$ spin-orbit interaction removes the$p_x/p_y$ orbital degeneracy and induces $p_x \pm ip_y$ type spin-orbitcoupling near the A point. The inner and outer Fermi surfaces are entangled bythe Te $5p$ and Ir $5d$ spin-orbit interactions which may provide exoticsuperconductivity with singlet-triplet mixing.

Important Roles of Te 5p and Ir 5d Spin-orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir1-xPtxTe2