{
  "id": "2303.01750",
  "version": "v1",
  "published": "2023-03-03T07:24:05.000Z",
  "updated": "2023-03-03T07:24:05.000Z",
  "title": "Aharonov-Bohm interference and phase-coherent surface-state transport in topological insulator rings",
  "authors": [
    "Gerrit Behner",
    "Abdur Rehman Jalil",
    "Dennis Heffels",
    "Jonas Kölzer",
    "Kristof Moors",
    "Jonas Mertens",
    "Erik Zimmermann",
    "Gregor Mussler",
    "Peter Schüffelgen",
    "Hans Lüth",
    "Detlev Grützmacher",
    "Thomas Schäpers"
  ],
  "comment": "11 pages (including Supplementary Material), 5 figures, 4 supplementary figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We present low-temperature magnetotransport measurements on selectively-grown Sb$_2$Te$_3$-based topological insulator ring structures. These topological insulator ring geometries display clear Aharonov-Bohm oscillations in the conductance originating from phase-coherent transport around the ring. The temperature dependence of the oscillation amplitude indicates that the Aharonov-Bohm oscillations originate from ballistic transport along the ring arms. The oscillations can therefore be attributed to topological surface states, which can maintain a quasi-ballistic transport regime in the presence of disorder. Further insight on the phase coherence is gained by comparing with similar Aharonov-Bohm-type oscillations in topological insulator nanoribbons exposed to an axial magnetic field. Here, quasi-ballistic phase-coherent transport is confirmed for closed-loop topological surface states in transverse direction enclosing the cross-section of the nanoribbon. In contrast, the appearance of universal conductance fluctuations indicates phase-coherent transport in the diffuse regime, which is attributed to bulk carrier transport. Thus, it appears that even in the presence of diffusive $p$-type charge carriers in Aharonov-Bohm ring structures, phase-coherent quasi-ballistic transport of topologically protected surface states is maintained over long distances.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-03-03T07:24:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "topological insulator ring",
      "phase-coherent surface-state transport",
      "aharonov-bohm interference",
      "display clear aharonov-bohm oscillations",
      "geometries display clear aharonov-bohm"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}