Magnonic Su-Schrieffer-Heeger Model in Honeycomb Ferromagnets

Abstract

Topological electronics has extended its richness to non-electronic systems where phonons and magnons can play the role of electrons. In particular, topological phases of magnons can be enabled by the Dzyaloshinskii-Moriya interaction (DMI) which acts as an effective spin-orbit coupling. We show that besides DMI, an alternating arrangement of Heisenberg exchange interactions critically determines the magnon band topology, realizing a magnonic analog of the Su-Schrieffer-Heeger model. On a honeycomb ferromagnet with perpendicular anisotropy, we calculate the topological phase diagram, the chiral edge states, and the associated magnon Hall effect by allowing the relative strength of exchange interactions on different links to be tunable. Including weak phonon-magnon hybridization does not change the result. Candidate materials are discussed.

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Cited by in corpus (8)

• Topological Phase Transitions of Dirac Magnons in Honeycomb Ferromagnets
• Magnon corner states in twisted bilayer honeycomb magnets
• Topological Phases of Tight-Binding Trimer Lattice in the BDI Symmetry Class
• Topological magnons in one-dimensional ferromagnetic Su-Schrieffer-Heeger model with anisotropic interaction
• Intrinsic topological magnons in arrays of magnetic dipoles
• Topological switching in bilayer magnons via electrical control
• Rhombohedral graphite junctions as a platform for continuous tuning between topologically trivial and non-trivial electronic phases
• Topological edge states in dipolar zig-zag stripes