Prediction of a Topological Magnon Insulator in a Two-Dimensional Chern Ferromagnet V<sub>2</sub>WS<sub>4</sub> Monolayer.
basic_science · Level V
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- Record sourced from PubMed, PMID 40958448.
- Also identified by DOI 10.1021/acs.nanolett.5c03782.
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Abstract
The Chern insulator (CI) and its bosonic analogue, a topological magnon insulator (TMI), are of considerable fundamental and technological significance in low-dissipation devices. Here, we put forward the possibility that the exotic CI and TMI phases can emerge within a single two-dimensional (2D) ferromagnet. Taking the square lattice as an example, the V<sub>2</sub>WS<sub>4</sub> monolayer with a nonzero Chern number of <i>C</i> = 1 and the emergence of an electronic chiral edge state are employed as the material candidates to confirm the feasibility of our proposal. Moreover, the <i>M</i><sub><i>z</i></sub><i>C</i><sub>4<i>z</i></sub><sup>'</sup>-stabilized staggered alignment of the nearest-neighbor Dzyaloshinskii-Moriya interaction sustains an emergent gauge flux ϕ that breaks pseudospin time-reversal symmetry, thereby giving rise to the TMI with a nontrivial magnon Hall effect. This dual topology enables unprecedented cross-coupling of anomalous transport phenomena, offering a platform for interconversion spin and charge information with a high feasibility of applications in topological spintronics.