Topological Spin Excitations in Honeycomb Ferromagnet CrI 3

Chen, Lebing; Chung, Jae-Ho; Gao, Bin; Chen, Tong; Stone, Matthew B.; Kolesnikov, Alexander I.; Huang, Qingzhen; Dai, Pengcheng

doi:10.1103/PhysRevX.8.041028

Title: Topological Spin Excitations in Honeycomb Ferromagnet ${CrI}_{3}$

Journal Article · Wed Nov 14 00:00:00 EST 2018 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.8.041028· OSTI ID:1482155

Chen, Lebing; Chung, Jae-Ho; Gao, Bin; Chen, Tong; Stone, Matthew B.; Kolesnikov, Alexander I.; Huang, Qingzhen; Dai, Pengcheng

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 CrI₃ (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 CrI₃ can have robust topological properties potentially useful for dissipationless spintronic applications.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: DEAC05-00OR22725; AC05-00OR22725

OSTI ID:: 1482155

Alternate ID(s):: OSTI ID: 1528732

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 8 Journal Issue: 4; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 223 works

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