Fig. 2: Splitting of magnon modes in an altermagnet.
From: Structure, control, and dynamics of altermagnetic textures
a Splitting of magnon modes in RuO2 in two orthogonal directions calculated from DFT13 (markers), atomistic spin model (dashed lines), and phenomenological model (solid lines); the blue/white colors encode spectra obtained using spin-lattice model simulations, see Supplementary Materials. (I),(II) Spin-up and spin-down magnons with large k are determined by different stiffnesses (indicated by springs), while for small momenta magnons (marked by III) the dispersion is determined by the intersublattice exchange and the difference between the two magnon branches becomes negligible. b Angular (solid line; arbitrary units) and magnitude (color code) dependence of the frequency splitting of two magnon modes.
