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We have studied electronic structure of triangular latticeIr$_{1-x}$Pt$_x$Te$_2$ superconductor using photoemission spectroscopy andmodel calculations. Ir $4f$ core-level photoemission spectra show that Ir $5d$$t_{2g}$ charge modulation established in the low temperature phase of IrTe$_2$is suppressed by Pt doping. This observation indicates that the suppression ofcharge modulation is related to the emergence of superconductivity.Valence-band photoemission spectra of IrTe$_2$ suggest that the Ir $5d$ chargemodulation is accompanied by Ir $5d$ orbital reconstruction. Based on thephotoemission results and model calculations, we argue that theorbitally-induced Peierls effect governs the charge and orbital instability inthe Ir$_{1-x}$Pt$_x$Te$_2$.

Orbital Degeneracy and Peierls Instability in Triangular Lattice Superconductor Ir$_{1-x}$Pt$_x$Te$_2$