2022/03/03 by Tobias Weber, T. Weber, David Fobes +24 · 58 citations
Physics and Astronomy · #Condensed matter physics #Diffraction #Excitation #Ferromagnetism #Lattice (music) #Magnetic field #Magnetic properties of thin films #Magnon #Physics #Quantum and electron transport phenomena #Quantum mechanics #Reciprocal lattice #Skyrmion #Spin wave #Topological Materials and Phenomena #Topology (electrical circuits) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1126/science.abe4441
published in Science 375(6584), 1025-1030 (American Association for the Advancement of Science)
openalex publication_date 2022/03/03 · arxiv created 2022/03/15 · arxiv updated 2022/03/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
The motion of a spin excitation across topologically non-trivial magnetic order exhibits a deflection that is analogous to the effect of the Lorentz force on an electrically charged particle in an orbital magnetic field. We used polarized inelastic neutron scattering to investigate the propagation of magnons (i.e., bosonic collective spin excitations) in a lattice of skyrmion tubes in manganese silicide. For wave vectors perpendicular to the skyrmion tubes, the magnon spectra are consistent with the formation of finely spaced emergent Landau levels that are characteristic of the fictitious magnetic field used to account for the nontrivial topological winding of the skyrmion lattice. This provides evidence of a topological magnon band structure in reciprocal space, which is borne out of the nontrivial real-space topology of a magnetic order.