Collective spin dynamics of Z2 vortex crystals in triangular Kitaev-Heisenberg antiferromagnets

Mengqun Li, Natalia B. Perkins, Ioannis Rousochatzakis

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15 Scopus citations

Abstract

We show that the mesoscopic incommensurate Z2 vortex crystals proposed for layered triangular anisotropic magnets can be most saliently identified by two distinctive signatures in dynamical spin response experiments: the presence of pseudo-Goldstone phononlike modes at low frequencies ω, associated with the collective vibrations of the vortex cores, and a characteristic multiscattered intensity profile at higher ω, arising from a large number of Bragg reflections and magnon band gaps. These are direct fingerprints of the large vortex sizes and magnetic unit cells and the solitonic spin profile around the vortex cores.

Original languageEnglish (US)
Article number013002
JournalPhysical Review Research
Volume1
Issue number1
DOIs
StatePublished - Aug 2019

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© 2019 authors.

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