Theory of Raman response in three-dimensional Kitaev spin liquids: Application to β - comγpounds

Brent Perreault, Johannes Knolle, Natalia B. Perkins, F. J. Burnell

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Abstract

We calculate the Raman response for the Kitaev spin model on the H-0, H-1, and H- harmonic honeycomb lattices. We identify several quantitative features in the Raman spectrum that are characteristic of the spin liquid phase. Unlike the dynamical structure factor, which probes both the Majorana spinons and flux excitations that emerge from spin fractionalization, the Raman spectrum in the Kitaev models directly probes a density of states of pairs of fractional, dispersing Majorana spinons. As a consequence, the Raman spectrum in all these models is gapless for sufficiently isotropic couplings, with a low-energy power law that results from the Fermi lines (or points) of the dispersing Majorana spinons. We show that the polarization dependence of the Raman spectrum contains crucial information about the symmetry of the ground state. We also discuss to what extent the features of the Raman response that we find reflect generic properties of the spin liquid phase, and comment on their possible relevance to α-, β-, and γ-Li2IrO3 compounds.

Original languageEnglish
Article number094439
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number9
DOIs
StatePublished - 25 Sep 2015
Externally publishedYes

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