Weyl and Nodal Ring Magnons in Three-Dimensional Honeycomb Lattices
Kang-Kang Li1,2** , Jiang-Ping Hu1,2,3
1 Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Beijing 1001902 School of Physics, University of Chinese Academy of Sciences, Beijing 1000493 Collaborative Innovation Center of Quantum Matter, Beijing 100871
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.
收稿日期: 2017-04-17
出版日期: 2017-06-23
:
75.30.Ds
(Spin waves)
75.50.Dd
(Nonmetallic ferromagnetic materials)
75.70.Rf
(Surface magnetism)
75.90.+w
(Other topics in magnetic properties and materials)
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2017, Vol. 34 
