We report the motion of a spin excitation across topologically nontrivial 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.
Weber, T., et al. "Topological magnon band structure of emergent Landau levels in a skyrmion lattice." Science, vol. 375, no. 6584, Mar. 2022. https://doi.org/10.1126/science.abe4441
Weber, T., Fobes, D. M., Waizner, J., Steffens, P., Tucker, G. S., Böhm, M., Beddrich, L., Franz, C., Gabold, H., Bewley, R., Voneshen, D., Skoulatos, M., Georgii, R., Ehlers, G., Bauer, A., Pfleiderer, C., Böni, P., Janoschek, M., & Garst, M. (2022). Topological magnon band structure of emergent Landau levels in a skyrmion lattice. Science, 375(6584). https://doi.org/10.1126/science.abe4441
Weber, T., Fobes, D. M., Waizner, J., et al., "Topological magnon band structure of emergent Landau levels in a skyrmion lattice," Science 375, no. 6584 (2022), https://doi.org/10.1126/science.abe4441
@article{osti_1855131,
author = {Weber, T. and Fobes, D. M. and Waizner, J. and Steffens, P. and Tucker, G. S. and Böhm, M. and Beddrich, L. and Franz, C. and Gabold, H. and Bewley, R. and others},
title = {Topological magnon band structure of emergent Landau levels in a skyrmion lattice},
annote = {We report the motion of a spin excitation across topologically nontrivial 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.},
doi = {10.1126/science.abe4441},
url = {https://www.osti.gov/biblio/1855131},
journal = {Science},
issn = {ISSN 0036-8075},
number = {6584},
volume = {375},
place = {United States},
publisher = {AAAS},
year = {2022},
month = {03}}
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Deutsche Forschungsgemeinschaft (DFG); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)
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