Topological Magnon Bands in Ferromagnetic Star Lattice

Abstract

The experimental observation of topological magnon bands and thermal Hall effect in a kagomé lattice ferromagnet Cu(1-3, bdc) has inspired the search for topological magnon effects in various insulating ferromagnets that lack an inversion center allowing a Dzyaloshinskii-Moriya (DM) spin-orbit interaction. The star lattice (also known as the decorated honeycomb lattice) ferromagnets is an ideal candidate for this purpose because it is a variant of the kagomé lattice with additional links that connect the up-pointing and down-pointing triangles. This gives rise to twice the unit cell of the kagomé lattice, hence a more interesting topological magnon effects. In particular, the triangular bridges on the star lattice can be coupled either ferromagnetically or antiferromagnetically which is not possible on the kagome lattice ferromagnets. Here, we study DM-induced topological magnon bands, chiral edge modes, and thermal magnon Hall effect on the star lattice ferromagnet in different parameter regimes. The star lattice can also be visualized as the parent material from which topological magnon bands can be realized for the kagomé and honeycomb lattices in some limiting cases.

7 pages, 7 figures. Revised version with change of title

References in corpus (9)

• Observation of the Magnon Hall Effect
• Theoretical prediction of rotating magnon wavepacket in ferromagnets
• Topological Magnon Insulator in Insulating Ferromagnet
• An exact chiral spin liquid with non-Abelian anyons
• A Realization of the Haldane-Kane-Mele Model in a System of Localized Spins
• Tunable magnon Weyl points in ferromagnetic pyrochlores
• Topological honeycomb magnon Hall effect: A calculation of thermal Hall conductivity of magnetic spin excitations
• Thermal Hall Effect of Spins in a Paramagnet
• Chirality-driven Hall Transport Phenomena of Spins

Cited by in corpus (9)

• Thermal Hall effect and topological edge states in a square lattice antiferromagnet
• Bulk and edge spin transport in topological magnon insulators
• Thermal Hall effect of magnons in collinear antiferromagnetic insulators: signatures of magnetic and topological phase transitions
• Magnon topology and thermal Hall effect in trimerized triangular lattice antiferromagnet
• Topological magnons in one-dimensional ferromagnetic Su-Schrieffer-Heeger model with anisotropic interaction
• High Chern numbers and topological flat bands in high-field polarized Kitaev magnets on the star lattice
• Quantum phases of spin-1/2 extended XY model in transverse magnetic field
• Tuning bulk topological magnon properties with light-induced magnons
• Magnetic phases of XY model with three-spin terms: interplay of topology and entanglement