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Topological Spin Excitations in Honeycomb Ferromagnet CrI3
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Journal Article
Topological Spin Excitations in Honeycomb Ferromagnet CrI3
2018
Overview
In two-dimensional honeycomb ferromagnets, bosonic magnon quasiparticles (spin waves) may either behave as massless Dirac fermions or form topologically protected edge states. The key ingredient defining their nature is the next-nearest-neighbor Dzyaloshinskii-Moriya interaction that breaks the inversion symmetry of the lattice and discriminates chirality of the associated spin-wave excitations. Using inelastic neutron scattering, we find that spin waves of the insulating honeycomb ferromagnetCrI3(TC=61K) have two distinctive bands of ferromagnetic excitations separated by a∼4meVgap at the Dirac points. These results can only be understood by considering a Heisenberg Hamiltonian with Dzyaloshinskii-Moriya interaction, thus providing experimental evidence that spin waves inCrI3can have robust topological properties potentially useful for dissipationless spintronic applications.
Publisher
American Physical Society
Subject
