{
  "id": "2007.04308",
  "version": "v1",
  "published": "2020-07-08T17:54:49.000Z",
  "updated": "2020-07-08T17:54:49.000Z",
  "title": "Strong spin-orbit interaction and $g$-factor renormalization of hole spins in Ge/Si nanowire quantum dots",
  "authors": [
    "F. N. M. Froning",
    "M. J. Rančić",
    "B. Hetényi",
    "S. Bosco",
    "M. K. Rehmann",
    "A. Li",
    "E. P. A. M. Bakkers",
    "F. A. Zwanenburg",
    "D. Loss",
    "D. M. Zumbühl",
    "F. R. Braakman"
  ],
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "The spin-orbit interaction lies at the heart of quantum computation with spin qubits, research on topologically non-trivial states, and various applications in spintronics. Hole spins in Ge/Si core/shell nanowires experience a spin-orbit interaction that has been predicted to be both strong and electrically tunable, making them a particularly promising platform for research in these fields. We experimentally determine the strength of spin-orbit interaction of hole spins confined to a double quantum dot in a Ge/Si nanowire by measuring spin-mixing transitions inside a regime of spin-blockaded transport. We find a remarkably short spin-orbit length of $\\sim$65 nm, comparable to the quantum dot length and the interdot distance. We additionally observe a large orbital effect of the applied magnetic field on the hole states, resulting in a large magnetic field dependence of the spin-mixing transition energies. Strikingly, together with these orbital effects, the strong spin-orbit interaction causes a significant enhancement of the $g$-factor with magnetic field.The large spin-orbit interaction strength demonstrated is consistent with the predicted direct Rashba spin-orbit interaction in this material system and is expected to enable ultrafast Rabi oscillations of spin qubits and efficient qubit-qubit interactions, as well as provide a platform suitable for studying Majorana zero modes.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-07-08T17:54:49.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ge/si nanowire quantum dots",
      "strong spin-orbit interaction",
      "hole spins",
      "factor renormalization",
      "direct rashba spin-orbit interaction"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}