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  • Title: Topological Spin Excitations in Honeycomb Ferromagnet CrI 3 .
    Author: Chen L, Chung JH, Gao B, Chen T, Stone MB, Kolesnikov AI, Huang Q, Dai P.
    Journal: Phys Rev X; 2018 Dec; 8(4):. PubMed ID: 38915421.
    Abstract:
    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 ferromagnet CrI 3 ( T C = 61 K ) have two distinctive bands of ferromagnetic excitations separated by a ∼4 meV gap 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 in CrI 3 can have robust topological properties potentially useful for dissipationless spintronic applications.
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