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Kitaev materials
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DOI：10.1016/j.physrep.2021.11.003.png)
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Abstract
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In transition-metal compounds with partially filled 4d and 5d shells spin-orbit entanglement, electronic correlations, and crystal-field effects conspire to give rise to a variety of novel forms of topological quantum matter. This includes Kitaev materials - a family of spin-orbit assisted Mott insulators, in which local, spin-orbit entangled j = 1/2 moments form that are subject to dominant bond-directional Ising exchange interactions. On a conceptual level, Kitaev materials attract much interest for their potential for unconventional forms of magnetism, such as spin liquid physics in two and three-dimensional lattice geometries or the formation of non-trivial spin textures. Experimentally, a number of Kitaev materials have been synthesized, which includes the honeycomb materials Na2IrO3, alpha-Li2IrO3, H3LiIr2O6, and, most prominently, alpha-RuCl3, the triangular materials Ba(3)IrxTi(3-x)O(9), as well as the three-dimensional hyper-honeycomb and stripy-honeycomb materials beta-Li2IrO3 and gamma-Li2IrO3. We provide a short review of the current status of the theoretical and experimental exploration of these Kitaev materials. (c) 2021 The Author(s). Published by Elsevier B.V.
Keywords:
Spin-orbit entangled Mott insulators
Kitaev model
Spin liquids
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