{
  "id": "1401.4536",
  "version": "v2",
  "published": "2014-01-18T12:43:10.000Z",
  "updated": "2014-02-25T10:59:36.000Z",
  "title": "Quantum Rings in Magnetic Fields and Spin Current Generation",
  "authors": [
    "Michele Cini",
    "Stefano Bellucci"
  ],
  "comment": "8 Figures; some errors in writing corrected, Figures improved. To appear in Journal of Physics: COndensed Matter",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We propose three different mechanisms for pumping spin-polarized currents in a ballistic circuit using a time-dependent magnetic field acting on an asymmetrically connected quantum ring at half filling. The first mechanism works thanks to a rotating magnetic field and produces an alternating current with a partial spin polarization. The second mechanism works by rotating the ring in a constant field; like the former case, it produces an alternating charge current but the spin current is d.c.; both methods do not require a spin-orbit interaction to achieve the polarized current, but the rotating ring could be used to measure the spin-orbit interaction in the ring using characteristic oscillations. On the other hand, the last mechanism that we propose depends on the spin-orbit interaction in an essential way, and requires a time-dependent magnetic field in the plane of the ring. This arrangement can be designed to pump a purely spin current. The absence of a charge current is demonstrated analytically. Moreover, a simple formula for the current is derived and compared to the numerical results.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2014-02-25T10:59:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spin current generation",
      "quantum ring",
      "spin-orbit interaction",
      "time-dependent magnetic field",
      "first mechanism works thanks"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014arXiv1401.4536C"
    }
  }
}