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We study with Angle Resolved PhotoElectron Spectroscopy (ARPES) the evolutionof the electronic structure of Sr2IrO4, when holes or electrons are introduced,through Rh or La substitutions. At low dopings, the added carriers occupy thefirst available states, at bottom or top of the gap, revealing an anisotropicgap of 0.7eV in good agreement with STM measurements. At further doping, weobserve a reduction of the gap and a transfer of spectral weight across thegap, although the quasiparticle weight remains very small. We discuss theorigin of the in-gap spectral weight as a local distribution of gap values.

Transfer of spectral weight across the gap of Sr2IrO4 induced by La doping