{
  "id": "1810.06212",
  "version": "v1",
  "published": "2018-10-15T07:57:30.000Z",
  "updated": "2018-10-15T07:57:30.000Z",
  "title": "Steering Magnetic Skyrmions with Nonequilibrium Green's Functions",
  "authors": [
    "Emil Viñas Boström",
    "Claudio Verdozzi"
  ],
  "comment": "10 pages, 8 figures, contribution to the proceedings of \"Progress in Nonequilibrium Green's Functions VII\"",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci",
    "cond-mat.other"
  ],
  "abstract": "Magnetic skyrmions, topologically protected vortex-like configurations in spin textures, are of wide conceptual and practical appeal for quantum information technologies, notably in relation to the making of so-called race-track memory devices. Skyrmions can be created, steered and destroyed with magnetic fields and/or (spin) currents. Here we focus on the latter mechanism, analyzed via a microscopic treatment of the skyrmion-current interaction. The system we consider is an isolated skyrmion in a square-lattice cluster, interacting with electrons spins in a current-carrying quantum wire. For the theoretical description, we employ a quantum formulation of spin-dependent currents via nonequilibrium Green's functions (NEGF) within the generalized Kadanoff-Baym ansatz (GKBA). This is combined with a treatment of skyrmions based on classical localized spins, with the skyrmion motion described via Ehrenfest dynamics. With our mixed quantum-classical scheme, we assess how time-dependent currents can affect the skyrmion dynamics, and how this in turn depends on electron-electron and spin-orbit interactions in the wire. Our study shows the usefulness of a quantum-classical treatment of skyrmion steering via currents, as a way for example to validate/extract an effective, classical-only, description of skyrmion dynamics from a microscopic quantum modeling of the skyrmion-current interaction.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-10-15T07:57:30.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "nonequilibrium greens functions",
      "steering magnetic skyrmions",
      "skyrmion-current interaction",
      "skyrmion dynamics",
      "race-track memory devices"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}