Dirac cones and valley topological states of classical spin waves in artificial magnonic crystals with two-dimensional honeycomb lattice. (1st April 2022)

• Record Type: Journal Article
• Authors: Liang, Yu; Lin, Jizhe; Yun, Guohong; Bai, Narsu; Cao, Yongjun
• Is Part Of: Materials research express. Volume 9:Number 4(2022)
• Publication Date: 2022-04-01
• Subjects: magnonic crystals -- dirac cones -- spin-wave physics -- artificial media; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ac5f8b
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: A model of artificial magnonic crystals (AMCs) with a two-dimensional honeycomb lattice of cylindrical ferromagnetic rods embedded in another ferromagnetic material is proposed. Topological properties including Dirac cones, Dirac-like point and valley states of classical spin waves in the above AMCs are theoretically investigated by numerically solving the Landau-Lifshitz equation. It is shown that Dirac cones and valley states at the boundary of the first Brillouin zone can be generated in the dispersion relation. Furthermore, Dirac-like point can also be obtained at the center of the first Brillouin zone due to the accidental degeneracy of the magnonic bands. These discoveries of Dirac cones, Dirac-like point and valley topological states in artificial magnonic crystals not only open a new field in topological condensed matter, but also provide a novel platform for fabricating topological classical spin-wave devices.