Zero-Frequency Chiral Magnonic Edge States Protected by Nonequilibrium Topology.
Phys Rev Lett
; 131(12): 126601, 2023 Sep 22.
Article
en En
| MEDLINE
| ID: mdl-37802951
ABSTRACT
Topological bosonic excitations must, in contrast to their fermionic counterparts, appear at finite energies. This is a key challenge for magnons, as it prevents straightforward excitation and detection of topologically protected magnonic edge states and their use in magnonic devices. In this Letter, we show that in a nonequilibrium state, in which the magnetization is pointing against the external magnetic field, the topologically protected chiral edge states in a magnon Chern insulator can be lowered to zero frequency, making them directly accessible by existing experimental techniques. We discuss the spin-orbit torque required to stabilize this nonequilibrium state, and show explicitly using numerical Landau-Lifshitz-Gilbert simulations that the edge states can be excited with a microwave field. Finally, we consider a propagating spin wave spectroscopy experiment, and demonstrate that the edge states can be directly detected.
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01-internacional
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2023
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Article
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Países Bajos