Topological Magnon Insulator in Insulating Ferromagnet
By Lifa Zhang, Jie Ren, Jian-Sheng Wang, Baowen Li. 2012
273 citations recorded by the source corpus.
In the ferromagnetic insulator with the Dzyaloshinskii-Moriya interaction, we theoretically predict and numerically verify a topological magnon insulator, where the charge-free magnon is topologically protected for transporting along the edge/surface while it is insulating in the bulk. The chiral edge states form a connected loop as a $4\ensuremath{\pi}$- or $8\ensuremath{\pi}$-period M\"obius strip in the spin-wave vector space, showing the nontrivial topology of magnonic bands. Using the nonequilibrium Green's function method, we explicitly demonstrate that the one-way chiral edge transport is indeed topologically protected from defects or disorders. Moreover, we show that the topological edge state mainly localizes around edges and leaks into the bulk with oscillatory decay. Although the chiral edge magnons and energy current prefer to travel along one edge from the hot region to the cold one, the anomalous transports are identified in the opposite edge, which reversely flow from the cold region to the hot one. Our findings could be validated within wide energy ranges in various magnonic crystals, such as Lu${}_{2}$V${}_{2}$O${}_{7}$.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/d00a9a34bfca0c943079c81e1cc9cc7b654c775a
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In Atomic and Molecular Physics, and Optics
In Condensed Matter Physics
Citations in the corpus
- Magnetic texture based magnonics (2020, background): “Furthermore, periodical inhomegeneous DMI [407] can result in spin-wave band gaps [405] in a chiral magnonic crystal [408, 409, 410].”
- Dirac Magnons in Honeycomb Ferromagnets (2017, unknown): “A number of these systems are gapped by the Dzyaloshinskii-Moriya interaction [7,19,20], producing nontrivial Haldane topology and chiral edge states, which are protected against backscattering and could, thus, be used for spintronic applications.”