Topological Spin Excitations in Honeycomb Ferromagnet CrI3

Lebing Chen, Jaiho Chung, Bin Gao, Tong Chen, Matthew B. Stone, Alexander I. Kolesnikov, Qingzhen Huang, Pengcheng Dai

Research output: Contribution to journalArticle

19 Citations (Scopus)

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.

Original languageEnglish
Article number041028
JournalPhysical Review X
Volume8
Issue number4
DOIs
Publication statusPublished - 2018 Nov 14

Fingerprint

magnons
excitation
wave excitation
chirality
ingredients
inelastic scattering
neutron scattering
fermions
interactions
inversions
symmetry

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Chen, L., Chung, J., Gao, B., Chen, T., Stone, M. B., Kolesnikov, A. I., ... Dai, P. (2018). Topological Spin Excitations in Honeycomb Ferromagnet CrI3 Physical Review X, 8(4), [041028]. https://doi.org/10.1103/PhysRevX.8.041028

Topological Spin Excitations in Honeycomb Ferromagnet CrI3 . / Chen, Lebing; Chung, Jaiho; Gao, Bin; Chen, Tong; Stone, Matthew B.; Kolesnikov, Alexander I.; Huang, Qingzhen; Dai, Pengcheng.

In: Physical Review X, Vol. 8, No. 4, 041028, 14.11.2018.

Research output: Contribution to journalArticle

Chen, L, Chung, J, Gao, B, Chen, T, Stone, MB, Kolesnikov, AI, Huang, Q & Dai, P 2018, 'Topological Spin Excitations in Honeycomb Ferromagnet CrI3 ', Physical Review X, vol. 8, no. 4, 041028. https://doi.org/10.1103/PhysRevX.8.041028
Chen, Lebing ; Chung, Jaiho ; Gao, Bin ; Chen, Tong ; Stone, Matthew B. ; Kolesnikov, Alexander I. ; Huang, Qingzhen ; Dai, Pengcheng. / Topological Spin Excitations in Honeycomb Ferromagnet CrI3 In: Physical Review X. 2018 ; Vol. 8, No. 4.
@article{71f2faace4f74d84a556df8c24adf1c9,
title = "Topological Spin Excitations in Honeycomb Ferromagnet CrI3",
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.",
author = "Lebing Chen and Jaiho Chung and Bin Gao and Tong Chen and Stone, {Matthew B.} and Kolesnikov, {Alexander I.} and Qingzhen Huang and Pengcheng Dai",
year = "2018",
month = "11",
day = "14",
doi = "10.1103/PhysRevX.8.041028",
language = "English",
volume = "8",
journal = "Physical Review X",
issn = "2160-3308",
publisher = "American Physical Society",
number = "4",

}

TY - JOUR

T1 - Topological Spin Excitations in Honeycomb Ferromagnet CrI3

AU - Chen, Lebing

AU - Chung, Jaiho

AU - Gao, Bin

AU - Chen, Tong

AU - Stone, Matthew B.

AU - Kolesnikov, Alexander I.

AU - Huang, Qingzhen

AU - Dai, Pengcheng

PY - 2018/11/14

Y1 - 2018/11/14

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85057336501&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057336501&partnerID=8YFLogxK

U2 - 10.1103/PhysRevX.8.041028

DO - 10.1103/PhysRevX.8.041028

M3 - Article

AN - SCOPUS:85057336501

VL - 8

JO - Physical Review X

JF - Physical Review X

SN - 2160-3308

IS - 4

M1 - 041028

ER -