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Title: Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β-Li2IrO3
Authors: Ducatman, Samuel
Rousochatzakis, Ioannis
Perkins, Natalia B.
Issue Date: 2018
Publisher: © American Physical Society
Citation: DUCATMAN, S., ROUSOCHATZAKIS, I. and PERKINS, N.B., 2018. Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β-Li2IrO3. Physical Review B, 97: 125125.
Abstract: © 2018 American Physical Society. We present a theoretical study of the static and dynamical properties of the three-dimensional, hyperhoneycomb Kitaev magnet β-Li2IrO3. We argue that the observed incommensurate order can be understood in terms of a long-wavelength twisting of a nearby commensurate period-3 state, with the same key qualitatively features. The period-3 state shows very different structure when either the Kitaev interaction K or the off-diagonal exchange anisotropy Γ is dominant. A comparison of the associated static spin structure factors with reported scattering experiments in zero and finite fields gives strong evidence that β-Li2IrO3 lies in the regime of dominant Kitaev coupling, and that the Heisenberg exchange J is much weaker than both K and Γ. Our predictions for the magnon excitation spectra, the dynamical spin structure factors, and their polarization dependence provide additional distinctive fingerprints that can be checked experimentally.
Description: This paper was accepted for publication in the journal Physical Review B and the definitive published version is available at https://doi.org/10.1103/PhysRevB.97.125125
Version: Accepted for publication
DOI: 10.1103/PhysRevB.97.125125
URI: https://dspace.lboro.ac.uk/2134/33687
Publisher Link: https://doi.org/10.1103/PhysRevB.97.125125
ISSN: 2469-9950
Appears in Collections:Published Articles (Physics)

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