{
  "id": "1502.01402",
  "version": "v1",
  "published": "2015-02-05T00:51:44.000Z",
  "updated": "2015-02-05T00:51:44.000Z",
  "title": "Tunable magnetic phases in quasi-one-dimensional systems",
  "authors": [
    "Alfredo X. Sánchez",
    "Jean-Pierre Leburton"
  ],
  "comment": "11 pages; 7 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "There has been considerable debate on the onset of exotic spin phenomena in quantum wires due to enhanced many-body effects caused by the one-dimensional (1D) alignment of charge carriers. We explain various observed spin effects, such as a carrier density-dependent spin-flip in dilute quasi-1D systems and the variability of the spin polarization in quantum point contacts, by using an unrestricted Hartree-Fock approach with a three-dimensional (3D) Coulomb interaction. The model dimensionality is critical in identifying a complex pattern of magnetic phases varying with confinement and magnetic field. In the limit of vanishing magnetic fields, we show the emergence of a degenerate excited state with opposite spin polarization above a confinement-dependent 1D concentration threshold, which is consistent with observations of a conductance plateau at half the conductance quantum $G_{0}/2=e^{2}/h$, even in the absence of spin-orbit interactions. Moreover, spin polarization disappears in highly-asymmetrically confined wires, and strictly two-dimensional systems.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-02-05T00:51:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "tunable magnetic phases",
      "quasi-one-dimensional systems",
      "confinement-dependent 1d concentration threshold",
      "magnetic field",
      "exotic spin phenomena"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}