Raman Scattering Signatures of Kitaev Spin Liquids in A2 IrO3 Iridates
Abstract
We study theoretically the Raman scattering response I(ω) in the gapless quantum spin liquid phase of the Kitaev-Heisenberg model. The dominant polarization-independent contribution IK (ω) reflects the density of states of the emergent Majorana fermions in the ground-state flux-sector. The integrability-breaking Heisenberg exchange generates a second contribution, whose dominant part IH (ω) has the form of a quantum quench corresponding to an abrupt insertion of four Z2 gauge fluxes. This results in a weakly polarization dependent response with a sharp peak at the energy of the flux excitation accompanied by broad features, which can be related to Majorana fermions in the presence of the perturbed gauge field. We discuss the experimental situation and explore more generally the influence of integrability breaking for Kitaev spin liquid response functions.
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