Unconventional magnons in collinear magnets dictated by spin space groups.

ABSTRACT: Magnonic systems provide a fertile playground for bosonic topology¹, for example, Dirac^2-6 and Weyl^7,8 magnons, leading to a variety of exotic phenomena such as charge-free topologically protected boundary modes^6,7, the magnon thermal Hall effect⁹ and the magnon spin Nernst effect¹⁰. However, their understanding has been hindered by the absence of fundamental symmetry descriptions of magnetic geometries and spin Hamiltonians primarily governed by isotropic Heisenberg interactions. The ensuing magnon dispersions enable gapless magnon band nodes that go beyond the scenario of representation theory of the magnetic space groups^11,12, thus referred to as unconventional magnons. Here we developed spin space group¹³

SUBMITTER: Chen X 

PROVIDER: S-EPMC11981943 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature