Spin dynamics of counterrotating Kitaev spirals via duality
Author(s)
Kimchi, Itamar; Coldea, Radu
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Incommensurate spiral order is a common occurrence in frustrated magnetic insulators. Typically, all magnetic moments rotate uniformly, through the same wavevector. However the honeycomb iridates family Li[subscript 2]IrO[subscript 3] shows an incommensurate order where spirals on neighboring sublattices are counterrotating, giving each moment a different local environment. Theoretically describing its spin dynamics has remained a challenge: The Kitaev interactions proposed to stabilize this state, which arise from strong spin-orbit effects, induce magnon umklapp scattering processes in spin-wave theory. Here we propose an approach via a (Klein) duality transformation into a conventional spiral of a frustrated Heisenberg model, allowing a direct derivation of the dynamical structure factor. We analyze both Kitaev and Dzyaloshinskii-Moriya based models, both of which can stabilize counterrotating spirals, but with different spin dynamics, and we propose experimental tests to identify the origin of counterrotation.
Date issued
2016-11Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review B
Publisher
American Physical Society
Citation
Kimchi, Itamar, and Radu Coldea. “Spin Dynamics of Counterrotating Kitaev Spirals via Duality.” Physical Review B 94.20 (2016): n. pag. © 2016 American Physical Society
Version: Final published version
ISSN
2469-9950
2469-9969