Models and Materials for Generalized Kitaev Magnetism

Abstract

The exactly solvable Kitaev model on the honeycomb lattice has recently received enormous attention linked to the hope of achieving novel spin-liquid states with fractionalized Majorana-like excitations. In this review, we analyze the mechanism proposed by G. Jackeli and G. Khaliullin to identify Kitaev materials based on spin-orbital dependent bond interactions and provide a comprehensive overview of its implications in real materials. We set the focus on experimental results and current theoretical understanding of planar honeycomb systems (Na$_2$IrO$_3$, $α$-Li$_2$IrO$_3$, and $α$-RuCl$_3$), three-dimensional Kitaev materials ($β$- and $γ$-Li$_2$IrO$_3$), and other potential candidates, completing the review with the list of open questions awaiting new insights.

updated references, published version