{
  "id": "1703.05972",
  "version": "v1",
  "published": "2017-03-17T11:42:44.000Z",
  "updated": "2017-03-17T11:42:44.000Z",
  "title": "Giant spin splitting and $0 - π$ Josephson transitions from the Edelstein effect in quantum spin-Hall insulators",
  "authors": [
    "G. Tkachov"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Hybrid structures of quantum spin-Hall insulators (QSHIs) and superconductors present a unique opportunity to access dissipationless topological states of matter, which, however, is frequently hindered by the lack of control over the spin polarization in QSHIs. We propose a very efficient spin-polarization mechanism based on the magnetoelectric (Edelstein) effect in superconducting QSHI structures. It acts akin to the Zeeman splitting in an external magnetic field, but with an effective g-factor of order of 1000. We show that the Edelstein spin splitting triggers $0-\\pi$ Josephson transitions with a superharmonic $\\pi$-periodic current-phase relationship at the transition. This manifests itself as a crossover from $\\Phi_0$ - to $\\Phi_0/2$ - periodic magnetic oscillations of the Josephson current in a superconducting loop ($\\Phi_0=h/2e$ is the magnetic flux quantum). Such controllable $0-\\pi$ transitions offer new perspectives for dissipationless spintronic devices and engineering flux qubits.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-03-17T11:42:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum spin-hall insulators",
      "josephson transitions",
      "giant spin splitting",
      "edelstein effect",
      "external magnetic field"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}