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MA: Fachverband Magnetismus
MA 9: Magnonics I
MA 9.1: Talk
Monday, March 9, 2026, 15:00–15:15, HSZ/0004
Non-reciprocal phonon propagation along skyrmion strings — •Riccardo Ciola1, Naofumi Matsuyama2, Markus Garst1, Lars Franke1, Yoshimitsu Kohama2, Toshihiro Nomura3, Sergei Zherlitsyn4, and Shinichiro Seki2 — 1Karlsruhe Institute of Technology (KIT), Germany — 2University of Tokyo, Japan — 3Shizuoka University, Japan — 4Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Germany
Non-centrosymmetric cubic chiral magnets host two-dimensional skyrmion textures that extend in the third direction, forming strings. In this work, we investigate the influence of magneto-elastic coupling on the collective excitations of the incommensurate skyrmion lattice phase. Within a microscopic theoretical framework that combines a Ginzburg-Landau description of the chiral magnet with a coupling to the underlying atomic crystal, we predict that magneto-elastic interactions give rise to a pronounced nonreciprocity in the propagation of acoustic phonons along the skyrmion strings. This directional asymmetry stems from the hybridisation between skyrmion lattice magnon modes and acoustic phonons, resulting in hybridized quasiparticles with strongly modified dispersions. Furthermore, our theory predicts the emergence of a phason gap, i.e., a gap of the translational Goldstone mode of the skyrmion lattice induced by a distortion of the atomic crystal. Altogether, our findings establish skyrmion-based topological superlattices as a theoretical platform for engineering chimeric magnon-phonon excitations, opening new directions in quasiparticle design and emergent material functionalities.
Keywords: Skyrmion lattice; Magneto-elastic coupling; phonon magneto-chiral effect; nonreciprocal phonon; magnon-phonon hybridisation