We study the correlated electronic structure of single-layer iridates based on structurally undistorted ${\mathrm{Ba}}_2{\mathrm{IrO}}_4$. Starting from the first-principles band structure, the interplay between local Coulomb interactions and spin-orbit coupling is investigated by means of rotational-invariant slave-boson mean-field theory. The evolution from a three-band description towards an anisotropic one-band $(J=1/2)$ picture is traced. Single-site and cluster self-energies shed light on competing Slater- and Mott-dominated correlation regimes. A nodal/antinodal Fermi-surface dichotomy is revealed at strong coupling, with an asymmetry between electron and hole doping. Electron-doped iridates show clearer tendencies of Fermi-arc formation, reminiscent of hole-doped cuprates.

• Received 16 April 2015

DOI:https://doi.org/10.1103/PhysRevB.92.085141