Electronic excitations in $\gamma$-Li${}_2$IrO${}_3$

Abstract

We investigate the electronic properties of the three-dimensional stripyhoneycomb $\gamma$-Li${}_2$IrO${}_3$ via relativistic density functional theory calculations as well as exact diagonalization of finite clusters and explore the details of the optical conductivity. Our analysis of this quantity reveals the microscopic origin of the experimentally observed (i) optical transitions and (ii) anisotropic behavior along the various polarization directions. In particular we find that the optical excitations are overall dominated by transitions between $j_{\text{eff}}$ = 1/2 and 3/2 states and the weight of transitions between $j_{\text{eff}}$ = 1/2 states at low frequencies can be correlated to deviations from a pure Kitaev description. We furthermore reanalyze within this approach the electronic excitations in the known two-dimensional honeycomb systems $\alpha$-Li${}_2$IrO${}_3$ and Na${}_2$IrO${}_3$ and discuss the results in comparison to $\gamma$-Li${}_2$IrO${}_3$.

replaced results for $\alpha$-Li${}_2$IrO${}_3$ with new single-crystal data; corrected typos; reorganized sections

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Cited by in corpus (8)

• Models and Materials for Generalized Kitaev Magnetism
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• High-pressure versus isoelectronic doping effect on the honeycomb iridate Na${}_2$IrO${}_3$
• Kitaev magnetism through the prism of lithium iridate
• Anisotropy as a diagnostic test for distinct tensor network wavefunctions of integer and half-integer spin Kitaev quantum spin liquids
• Optical signature of the pressure-induced dimerization in the honeycomb iridate $\alpha$-Li${}_2$IrO${}_3$
• Role of disorder in the electronic and magnetic properties of Ag${}_3$LiIr${}_2$O${}_6$
• Fluorite-related iridate Pr${}_3$IrO${}_7$: Crystal growth, structure, magnetism, thermodynamic, and optical properties