{
  "id": "2401.07839",
  "version": "v1",
  "published": "2024-01-15T17:11:11.000Z",
  "updated": "2024-01-15T17:11:11.000Z",
  "title": "Theory for Cd$_3$As$_2$ thin films in the presence of magnetic fields",
  "authors": [
    "M. Smith",
    "V. L. Quito",
    "A. A. Burkov",
    "P. P. Orth",
    "I. Martin"
  ],
  "comment": "17 pages, 8 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We present a theory for thin films of the Dirac semimetal Cd$_3$As$_2$ in the presence of magnetic fields. We show that, above a critical thickness, specific subbands $n$ of thin film Cd$_3$As$_2$ are in a quantum spin Hall insulator regime and study their response to in- and out-of-plane magnetic fields. We find that sufficiently large in-plane Zeeman fields drive the system toward a 2D Dirac semimetal regime, provided the field is directed perpendicular to a high-symmetry mirror plane. For other directions, we find the Dirac points to be weakly gapped. We further investigate how the system responds to finite out-of-plane field components, both starting from the quantum spin Hall regime at small in-plane fields and from the 2D Dirac semimetal regimes at larger in-plane fields, addressing recent experimental observations in [A. C. Lygo et al., Phys. Rev. Lett. 130 046201 (2023)] and [B. Guo et al., Phys. Rev. Lett. 131, 046601(2023)].",
  "revisions": [
    {
      "version": "v1",
      "updated": "2024-01-15T17:11:11.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "magnetic fields",
      "thin film",
      "large in-plane zeeman fields",
      "2d dirac semimetal regime",
      "spin hall insulator regime"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}