$Magnetic Field Effect on Topological Spin Excitations in CrI_{3}$
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Magnetic Field Effect on Topological Spin Excitations in CrI_{3}

The search for topological spin excitations in recently discovered two-dimensional (2D) van der Waals (vdW) magnetic materials is important because of their potential applications in dissipationless spintronics. In the 2D vdW ferromagnetic (FM) honeycomb lattice CrI_{3} (T_{C}=61 K), acoustic and o...

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Autores principales:	Lebing Chen, Jae-Ho Chung, Matthew B. Stone, Alexander I. Kolesnikov, Barry Winn, V. Ovidiu Garlea, Douglas L. Abernathy, Bin Gao, Mathias Augustin, Elton J. G. Santos, Pengcheng Dai
Formato:	article
Lenguaje:	EN
Publicado:	American Physical Society 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/eb7e77ed966a449b8640f82bc983ca41
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spelling	oai:doaj.org-article:eb7e77ed966a449b8640f82bc983ca412021-12-02T19:02:08ZMagnetic Field Effect on Topological Spin Excitations in CrI_{3}10.1103/PhysRevX.11.0310472160-3308https://doaj.org/article/eb7e77ed966a449b8640f82bc983ca412021-08-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.031047http://doi.org/10.1103/PhysRevX.11.031047https://doaj.org/toc/2160-3308The search for topological spin excitations in recently discovered two-dimensional (2D) van der Waals (vdW) magnetic materials is important because of their potential applications in dissipationless spintronics. In the 2D vdW ferromagnetic (FM) honeycomb lattice CrI_{3} (T_{C}=61 K), acoustic and optical spin waves are found to be separated by a gap at the Dirac points. The presence of such a gap is a signature of topological spin excitations if it arises from the next-nearest-neighbor (NNN) Dzyaloshinskii-Moriya (DM) or bond-angle-dependent Kitaev interactions within the Cr honeycomb lattice. Alternatively, the gap is suggested to arise from an electron correlation effect not associated with topological spin excitations. Here, we use inelastic neutron scattering to conclusively demonstrate that the Kitaev interactions and electron correlation effects cannot describe spin waves, Dirac gaps, and their in-plane magnetic field dependence. Our results support the idea that the DM interactions are the microscopic origin of the observed Dirac gap. Moreover, we find that the nearest-neighbor (NN) magnetic exchange interactions along the c axis are antiferromagnetic (AF), and the NNN interactions are FM. Therefore, our results unveil the origin of the observed c-axis AF order in thin layers of CrI_{3}, firmly determine the microscopic spin interactions in bulk CrI_{3}, and provide a new understanding of topology-driven spin excitations in 2D vdW magnets.Lebing ChenJae-Ho ChungMatthew B. StoneAlexander I. KolesnikovBarry WinnV. Ovidiu GarleaDouglas L. AbernathyBin GaoMathias AugustinElton J. G. SantosPengcheng DaiAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 3, p 031047 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Lebing Chen Jae-Ho Chung Matthew B. Stone Alexander I. Kolesnikov Barry Winn V. Ovidiu Garlea Douglas L. Abernathy Bin Gao Mathias Augustin Elton J. G. Santos Pengcheng Dai Magnetic Field Effect on Topological Spin Excitations in CrI_{3}
description	The search for topological spin excitations in recently discovered two-dimensional (2D) van der Waals (vdW) magnetic materials is important because of their potential applications in dissipationless spintronics. In the 2D vdW ferromagnetic (FM) honeycomb lattice CrI_{3} (T_{C}=61 K), acoustic and optical spin waves are found to be separated by a gap at the Dirac points. The presence of such a gap is a signature of topological spin excitations if it arises from the next-nearest-neighbor (NNN) Dzyaloshinskii-Moriya (DM) or bond-angle-dependent Kitaev interactions within the Cr honeycomb lattice. Alternatively, the gap is suggested to arise from an electron correlation effect not associated with topological spin excitations. Here, we use inelastic neutron scattering to conclusively demonstrate that the Kitaev interactions and electron correlation effects cannot describe spin waves, Dirac gaps, and their in-plane magnetic field dependence. Our results support the idea that the DM interactions are the microscopic origin of the observed Dirac gap. Moreover, we find that the nearest-neighbor (NN) magnetic exchange interactions along the c axis are antiferromagnetic (AF), and the NNN interactions are FM. Therefore, our results unveil the origin of the observed c-axis AF order in thin layers of CrI_{3}, firmly determine the microscopic spin interactions in bulk CrI_{3}, and provide a new understanding of topology-driven spin excitations in 2D vdW magnets.
format	article
author	Lebing Chen Jae-Ho Chung Matthew B. Stone Alexander I. Kolesnikov Barry Winn V. Ovidiu Garlea Douglas L. Abernathy Bin Gao Mathias Augustin Elton J. G. Santos Pengcheng Dai
author_facet	Lebing Chen Jae-Ho Chung Matthew B. Stone Alexander I. Kolesnikov Barry Winn V. Ovidiu Garlea Douglas L. Abernathy Bin Gao Mathias Augustin Elton J. G. Santos Pengcheng Dai
author_sort	Lebing Chen
title	Magnetic Field Effect on Topological Spin Excitations in CrI_{3}
title_short	Magnetic Field Effect on Topological Spin Excitations in CrI_{3}
title_full	Magnetic Field Effect on Topological Spin Excitations in CrI_{3}
title_fullStr	Magnetic Field Effect on Topological Spin Excitations in CrI_{3}
title_full_unstemmed	Magnetic Field Effect on Topological Spin Excitations in CrI_{3}
title_sort	magnetic field effect on topological spin excitations in cri_{3}
publisher	American Physical Society
publishDate	2021
url	https://doaj.org/article/eb7e77ed966a449b8640f82bc983ca41
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Magnetic Field Effect on Topological Spin Excitations in CrI_{3}

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