{
  "id": "2302.03214",
  "version": "v1",
  "published": "2023-02-07T02:55:05.000Z",
  "updated": "2023-02-07T02:55:05.000Z",
  "title": "Quantum transport properties of tantalum-oxide resistive switching filaments",
  "authors": [
    "Tímea Nóra Török",
    "Péter Makk",
    "Zoltán Balogh",
    "Miklós Csontos",
    "András Halbritter"
  ],
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "Filamentary resistive switching devices are not only considered as promising building blocks for brain-inspired computing architectures, but they also realize an unprecedented operation regime, where the active device volume reaches truly atomic dimensions. Such atomic-sized resistive switching filaments represent the quantum transport regime, where the transmission eigenvalues of the conductance channels are considered as a specific device fingerprint. Here, we gain insight into the quantum transmission properties of close-to-atomic-sized resistive switching filaments formed across an insulating Ta$_2$O$_5$ layer through superconducting subgap spectroscopy. This method reveals the transmission density function of the open conduction channels contributing to the device conductance. Our analysis confirms the formation of truly atomic-sized filaments composed of 3-8 Ta atoms at their narrowest cross-section. We find that this diameter remains unchanged upon resistive switching. Instead, the switching is governed by the redistribution of oxygen vacancies within the filamentary volume. The set/reset process results in the reduction/formation of an extended barrier at the bottleneck of the filament which enhances/reduces the transmission of the highly open conduction channels.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-02-07T02:55:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "tantalum-oxide resistive switching filaments",
      "quantum transport properties",
      "volume reaches truly atomic",
      "reaches truly atomic dimensions",
      "device volume reaches"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}