Correlation induced electron-hole asymmetry in quasi- two-dimensional iridates

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London : Nature Publishing Group

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.

angular momentum, asymmetry, crystallography, electron, superconductivity, motion, physics
Pärschke, E. M., Wohlfeld, K., Foyevtsova, K., & Van Den Brink, J. (2017). Correlation induced electron-hole asymmetry in quasi- two-dimensional iridates (Version publishedVersion, Vol. 8). Version publishedVersion, Vol. 8. London : Nature Publishing Group.