{
  "id": "2011.15008",
  "version": "v1",
  "published": "2020-11-30T17:12:23.000Z",
  "updated": "2020-11-30T17:12:23.000Z",
  "title": "Spin-Wave Doppler Shift by Magnon Drag in Magnetic Insulators",
  "authors": [
    "Tao Yu",
    "Chen Wang",
    "Michael A. Sentef",
    "Gerrit E. W. Bauer"
  ],
  "comment": "6 pages, 3 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Doppler shift of quasiparticle dispersion induced by charge currents is responsible for the critical supercurrents in superconductors and spin-wave instabilities by spin-transfer torque in metallic ferromagnets. Here we predict an analogous effect in thin films of magnetic insulators. A coherent spin current, excited by stripline microwaves, or a thermal magnon current, driven by a temperature gradient, can induce a Doppler shift that tilts the magnon dispersion in the spin-current direction. Around a critical driving strength, that is characterized by a spin-wave instability in the self-consistent mean-field treatment, the pumped magnon current reaches a maximum accompanied by a strong breaking of chiral pumping. The backaction of magnon currents on magnetic orders is therefore important for realizing large spin currents in low-dimensional magnonic devices.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-11-30T17:12:23.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spin-wave doppler shift",
      "magnetic insulators",
      "magnon drag",
      "spin-wave instability",
      "low-dimensional magnonic devices"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}