{
  "id": "2011.06899",
  "version": "v1",
  "published": "2020-11-13T13:31:18.000Z",
  "updated": "2020-11-13T13:31:18.000Z",
  "title": "Optical and magnetic signatures of the topological edge states in a dimerised donor chain",
  "authors": [
    "Wei Wu",
    "A. J. Fisher"
  ],
  "comment": "5 pages, 5 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We have studied the excited states of a one-dimensional donor dimer array by using time-dependent Hartree-Fock and density-functional theories. We find that tuning the inter-donor distances can induce a topological phase transition from a topologically trivial anti-ferromagnetic ground state to a topological phase supporting spin-polarised edge states. Significant changes in the optical spectra accompany this transition, providing signatures for the phase transition and the existence of the edge state; the edge states lead to a robust $1s\\rightarrow 2p$ atomic transition. By contrast, the bulk of the chain becomes spinless, inducing a reduction in the HOMO-LUMO gap and a decrease of the excitation energies in the optical spectra. The inclusion of physics beyond the Su-Schrieffer-Heeger-Hubbard model (long-range electron correlations and basis states beyond the 1s manifold) has a critical effect on the results and leads to the novel prediction of a change in optical response related to a topological phase transition. Our results provide a theoretical foundation for using artificial donor linear arrays in semiconductors to form topological edge states by design.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-11-13T13:31:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "topological edge states",
      "dimerised donor chain",
      "magnetic signatures",
      "trivial anti-ferromagnetic ground state",
      "supporting spin-polarised edge states"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}