Zero-frequency chiral magnonic edge states protected by non-equilibrium topology
arXiv:2302.06597 · doi:10.1103/PhysRevLett.131.126601
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 work, we show that in a non-equilibrium 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 non-equilibrium 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.
References in corpus (19)
- Topological Acoustics
- Observation of the Magnon Hall Effect
- Topological Magnon Insulator in Insulating Ferromagnet
- Thermal spin dynamics of yttrium iron garnet
- Tunable magnon Weyl points in ferromagnetic pyrochlores
- Dirac magnons in honeycomb ferromagnets
- Magnonic topological insulators in antiferromagnets
- Interaction-stabilized topological magnon insulator in ferromagnets
- Spin Injection and Detection via the Anomalous Spin Hall Effect in a Ferromagnetic Metal
- Chiral anomaly of Weyl magnons in stacked honeycomb ferromagnets
- Topological magnon band structure of emergent Landau levels in a skyrmion lattice
- Spin wave spectrum of the quantum ferromagnet on the pyrochlore lattice Lu2V2O7
- Magnonic Quadrupole Topological Insulator in Antiskyrmion Crystals
- Bosonic Bott Index and Disorder-Induced Topological Transitions of Magnons
- Chiral Hinge Magnons in Second-Order Topological Magnon Insulators
- Squaring the fermion: The threefold way and the fate of zero modes
- Direct optical probe of magnon topology in two-dimensional quantum magnets
- Magnon quantum anomalies in Weyl ferromagnets
- Theory for electrical detection of the magnon Hall effect induced by dipolar interactions