| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Weyl and Nodal Ring Magnons in Three-Dimensional Honeycomb Lattices |
| Kang-Kang Li1,2**, Jiang-Ping Hu1,2,3 |
1Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physics, University of Chinese Academy of Sciences, Beijing 100049
3Collaborative Innovation Center of Quantum Matter, Beijing 100871
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| Cite this article: |
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Kang-Kang Li, Jiang-Ping Hu 2017 Chin. Phys. Lett. 34 077501 |
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Abstract We study the topological properties of magnon excitations in a wide class of three-dimensional (3D) honeycomb lattices with ferromagnetic ground states. It is found that they host nodal ring magnon excitations. These rings locate on the same plane in the momentum space. The nodal ring degeneracy can be lifted by the Dzyaloshinskii–Moriya interactions to form two Weyl points with opposite charges. We explicitly discuss these physics in the simplest 3D honeycomb lattice and the hyperhoneycomb lattice, and show drumhead and arc surface states in the nodal ring and Weyl phases, respectively, due to the bulk-boundary correspondence.
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Received: 17 April 2017
Published: 23 June 2017
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| PACS: |
75.30.Ds
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(Spin waves)
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75.50.Dd
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(Nonmetallic ferromagnetic materials)
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75.70.Rf
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(Surface magnetism)
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75.90.+w
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(Other topics in magnetic properties and materials)
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| Fund: Supported by the National Basic Research Program of China under Grant No 2015CB921300, the National Natural Science Foundation of China under Grant No 11334012, and the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB07000000. |
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