Using density functional dynamical mean-field theory we investigate the site-selective electronic structure of Ca 2 O 3 Fe 3 S 2 . We confirm that the parent compound with two distinct iron sites is a multiorbital Mott insulator similar to La 2 O 3 Fe 2 S 2 . Upon electron/hole doping, carrier localization is found to persist in the two active iron channels because the chemical potential lies in a gap structure with anisotropic and almost vanishing states near the Fermi energy. This emergent behavior stems from large electronic reconstruction caused by dynamical spectral weight transfer involving states with distinct d-shell occupancies and orbital character at low energies. We detail the implications of our microscopic analysis and discuss the underlying physics which will emerge in future experiments on Ca 2 O 3 Fe 3 S 2 .
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