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Author: Foyevtsova, K. × DDC: 530 × Has files: Yes × Type: Text × Publisher: London : Nature Publishing Group × Subject: electron ×

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    Correlation induced electron-hole asymmetry in quasi- two-dimensional iridates
    (London : Nature Publishing Group, 2017) Pärschke, E.M.; Wohlfeld, K.; Foyevtsova, K.; Van Den Brink, J.
    The resemblance of crystallographic and magnetic structures of the quasi-two-dimensional iridates Ba2IrO4 and Sr2IrO4 to La2CuO4 points at an analogy to cuprate high-Tc superconductors, even if spin-orbit coupling is very strong in iridates. Here we examine this analogy for the motion of a charge (hole or electron) added to the antiferromagnetic ground state. We show that correlation effects render the hole and electron case in iridates very different. An added electron forms a spin polaron, similar to the cuprates, but the situation of a removed electron is far more complex. Many-body 5d 4 configurations form which can be singlet and triplet states of total angular momentum that strongly affect the hole motion. This not only has ramifications for the interpretation of (inverse-)photoemission experiments but also demonstrates that correlation physics renders electron- and hole-doped iridates fundamentally different.