Chiral Magnons in Altermagnetic RuO 2

Magnons in ferromagnets have one chirality, and typically are in the GHz range and have a quadratic dispersion near the zero wave vector. In contrast, magnons in antiferromagnets are commonly considered to have bands with both chiralities that are degenerate across the entire Brillouin zone, and to be in the THz range and to have a linear dispersion near the center of the Brillouin zone. Here we theoretically demonstrate a new class of magnons on a prototypical d-wave altermagnet RuO_{2} with the compensated antiparallel magnetic order in the ground state. Based on density-functional-theory calculations we observe that the THz-range magnon bands in RuO_{2} have an alternating chirality splitting, similar to…

• AV
  Alexander von Humboldt-Stiftung

  Award: 766566
• DF
  Deutsche Forschungsgemeinschaft

  Awards: 268565370, TRR 173, TRR 173 268565370, 173 268565370, LM2018140, TRR 288 Elasto-q-mat
• MŠ
  Ministerstvo Školství, Mládeže a Tělovýchovy

  Award: CEDAMNF CZ.02.1.01/0.0/0.0/15_003/0000358
• GA
  Grantová Agentura České Republiky

  Awards: 19-18623X, CZ.02.1.01/0.0, LM2018140, CZ.02.1.01, 19-06433S, 766566, LM2018096, LM2018110
• JG
  Johannes Gutenberg-Universität Mainz
• HF
  H2020 Future and Emerging Technologies

  Award: 766566