Topologically nontrivial magnonic solitons

Mehrdad Elyasi, Koji Sato, Gerrit E. W. Bauer

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9 Citations (Scopus)

Abstract

The intrinsic nonlinearities of the spin dynamics in condensed matter systems give rise to a rich phenomenology that can be strongly affected by topology. Here, we study formation of magnonic solitons in the topologically nontrivial band gap of a spin lattice realization of the Haldane model, in both static and dynamic (Floquet) regimes. We consider nonlinearities caused by magnetic crystalline anisotropy and magnon-magnon interactions. We find soliton formation power thresholds as a function of anisotropy coefficient and interaction strength. We predict different classes of topological solitons for the same topological class of the underlying lattice and explain it in terms of a transition from a topologically nontrivial mass to a trivial one. Our findings imply that a soliton can phase separate, containing boundaries between topologically trivial and nontrivial phases, which is associated with a vanishing spin-wave gap.

Original languageEnglish
Article number134402
Number of pages12
JournalPhysical Review B
Volume99
Issue number13
DOIs
Publication statusPublished - 1-Apr-2019

Keywords

  • SPIN
  • INSULATOR
  • ARRAYS
  • STATE

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