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Title: Topological Spin Excitations in Honeycomb Ferromagnet CrI 3

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 CrI3 (TC=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.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1482155
Alternate Identifier(s):
OSTI ID: 1528732
Grant/Contract Number:  
DEAC05-00OR22725; AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 8 Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Condensed Matter Physics; Magnetism; Topological Insulators

Citation Formats

Chen, Lebing, Chung, Jae-Ho, Gao, Bin, Chen, Tong, Stone, Matthew B., Kolesnikov, Alexander I., Huang, Qingzhen, and Dai, Pengcheng. Topological Spin Excitations in Honeycomb Ferromagnet CrI 3. United States: N. p., 2018. Web. doi:10.1103/PhysRevX.8.041028.
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Chen, Lebing, Chung, Jae-Ho, Gao, Bin, Chen, Tong, Stone, Matthew B., Kolesnikov, Alexander I., Huang, Qingzhen, & Dai, Pengcheng. Topological Spin Excitations in Honeycomb Ferromagnet CrI 3. United States. https://doi.org/10.1103/PhysRevX.8.041028
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Chen, Lebing, Chung, Jae-Ho, Gao, Bin, Chen, Tong, Stone, Matthew B., Kolesnikov, Alexander I., Huang, Qingzhen, and Dai, Pengcheng. Wed . "Topological Spin Excitations in Honeycomb Ferromagnet CrI 3". United States. https://doi.org/10.1103/PhysRevX.8.041028.
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@article{osti_1482155,
title = {Topological Spin Excitations in Honeycomb Ferromagnet CrI 3},
author = {Chen, Lebing and Chung, Jae-Ho and Gao, Bin and Chen, Tong and Stone, Matthew B. and Kolesnikov, Alexander I. and Huang, Qingzhen and Dai, Pengcheng},
abstractNote = {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 (TC=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.},
doi = {10.1103/PhysRevX.8.041028},
journal = {Physical Review. X},
number = 4,
volume = 8,
place = {United States},
year = {Wed Nov 14 00:00:00 EST 2018},
month = {Wed Nov 14 00:00:00 EST 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevX.8.041028
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Cited by: 223 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Top view of the honeycomb lattice and the out-of-plane components of the antisymmetric DM vectors. The triangular arrows mark the second nearest-neighbor bond orientations that share the common sign of DM vectors. (b) The BZ zone boundaries and the high symmetry points on the (h, k) plane.more » (c) Crystal and magnetic structures of CrI3 with the Heisenberg exchange paths. Iodine sites are not displayed for simplicity. The dotted lines denote the hexagonal unit cell boundary. (d) Inelastic neutron scattering results of spin waves with Ei = 50 meV along the high symmetry directions in the (h, k) plane, which are observed at 5 K and integrated over −5 ≤ l ≤ 5. The superimposed solid lines are the calculations by the Heisenberg-only model. (e) Low-energy spin-wave mode along the l direction (Ei = 8 meV). Note that the minima appear at l = 3n in the hexagonal setting. The data are normalized to the absolute units of mbarn/meV/Sr/f.u. (f.u. is formula unit) by a vanadium standard.« less
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