{
  "id": "2012.01395",
  "version": "v1",
  "published": "2020-12-02T18:42:13.000Z",
  "updated": "2020-12-02T18:42:13.000Z",
  "title": "Ballistic transport through quantum point contacts of multi-orbital oxides",
  "authors": [
    "J. Settino",
    "C. A. Perroni",
    "F. Romeo",
    "V. Cataudella",
    "R. Citro"
  ],
  "comment": "11 pages, 9 figures",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.str-el"
  ],
  "abstract": "Linear and non-linear transport properties through an atomic-size point contact based on oxides two-dimensional electron gas is examined using the tight-binding method and the $\\mathbf{k\\cdot p}$ approach. The ballistic transport is analyzed in contacts realized at the (001) interface between band insulators $LaAlO_3$ and $SrTiO_3$ by using the Landauer-B\\\"uttiker method for many sub-bands derived from three Ti 3d orbitals ($d_{yz}$, $d_{zx}$ and $d_{xy}$) in the presence of an out-of-plane magnetic field. We focus especially on the role played by the atomic spin-orbit coupling and the inversion symmetry breaking term pointing out three transport regimes: the first, at low energies, involving the first $d_{xy}$-like sub-bands, where the conductance quantization is robust; a second one, at intermediate energies, entailing further $d_{xy}$-like sub-bands, where the sub-band splitting induced by the magnetic field is quenched; the third one, where the mixing between light $d_{xy}$-like, heavy $d_{yz}$-like and $d_{zx}$-like sub-bands is so strong that the conductance plateaus turn out to be very narrow. Very good agreement is found with recent experiments exploring the transport properties at low energies.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-12-02T18:42:13.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum point contacts",
      "ballistic transport",
      "multi-orbital oxides",
      "symmetry breaking term pointing",
      "magnetic field"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}