{
  "id": "2308.00952",
  "version": "v1",
  "published": "2023-08-02T05:22:39.000Z",
  "updated": "2023-08-02T05:22:39.000Z",
  "title": "Over-Barrier Photoelectron Emission with Rashba Spin-Orbit Coupling",
  "authors": [
    "Bi Hong Tiang",
    "Yee Sin Ang",
    "L. K. Ang"
  ],
  "comment": "6 pages, 3 figures",
  "categories": [
    "cond-mat.mes-hall",
    "physics.app-ph"
  ],
  "abstract": "We develop a theoretical model to calculate the quantum efficiency (QE) of photoelectron emission from materials with Rashba spin-orbit coupling (RSOC) effect. In the low temperature limit, an analytical scaling between QE and the RSOC strength is obtained as QE $\\propto (\\hbar\\omega-W)^2+2E_R(\\hbar \\omega-W) -E_R^2/3$, where $\\hbar\\omega$, $W$ and $E_R$ are the incident photon energy, work function and the RSOC parameter respectively. Intriguingly, the RSOC effect substantially improves the QE for strong RSOC materials. For example, the QE of Bi$_2$Se$_3$ and Bi/Si(111) increases, by 149\\% and 122\\%, respectively due to the presence of strong RSOC. By fitting to the photoelectron emission characteristics, the analytical scaling law can be employed to extract the RSOC strength, thus offering a useful tool to characterize the RSOC effect in materials. Importantly, when the traditional Fowler-Dubridge model is used, the extracted results may substantially deviate from the actual values by $\\sim90\\%$, thus highlighting the importance of employing our model to analyse the photoelectron emission especially for materials with strong RSOC. These findings provide a theoretical foundation for the design of photoemitters using Rashba spintronic materials.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2023-08-02T05:22:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "rashba spin-orbit coupling",
      "over-barrier photoelectron emission",
      "rsoc effect",
      "rsoc strength",
      "rashba spintronic materials"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}