{
  "id": "1206.1295",
  "version": "v2",
  "published": "2012-06-06T18:46:42.000Z",
  "updated": "2012-06-14T02:07:13.000Z",
  "title": "Fractional Spin Josephson Effect and Electrically Controlled Magnetization in Quantum Spin Hall Edges",
  "authors": [
    "Qinglei Meng",
    "Vasudha Shivamoggi",
    "Taylor L. Hughes",
    "Matthew J. Gilbert",
    "Smitha Vishveshwara"
  ],
  "comment": "5 pages, 2 figures (v2:fixed typo, added reference)",
  "doi": "10.1103/PhysRevB.86.165110",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We explore a spin Josephson effect in a system of two ferromagnets coupled by a tunnel junction formed of 2D time-reversal invariant topological insulators. In analogy with the more commonly studied instance of the Josephson effect for charge in superconductors, we investigate properties of the phase-coherent {\\it spin} current resulting from the misalignment of the in-plane magnetization angles of the two ferromagnets. We show that the topological insulating barrier offers the exciting prospect of hosting a {\\it fractional} spin Josephson effect mediated by bound states at the ferromagnet-topological insulator interface. We provide multiple perspectives to understand the $4\\pi$ periodic nature of this effect. We discuss several measurable consequences, such as, the generation of a transverse voltage signal which allows for purely electrical measurements, an inverse of this effect where an applied voltage gives rise to a transverse spin-current, and a fractional AC spin-Josephson effect.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-06-14T02:07:13.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.23.-b",
      "74.50.+r"
    ],
    "keywords": [
      "quantum spin hall edges",
      "fractional spin josephson effect",
      "electrically controlled magnetization",
      "time-reversal invariant topological insulators"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2012,
      "month": "Oct",
      "volume": 86,
      "number": 16,
      "pages": 165110
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvB..86p5110M"
    }
  }
}