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Doping-Induced Quantum Spin Hall Insulator to Superconductor Transition.

Zhenjiu Wang1, Yuhai Liu2,3, Toshihiro Sato1

  • 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany.

Physical Review Letters
|June 10, 2021
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Doping a quantum spin Hall insulator can induce superconductivity through skyrmion condensation. This study models a direct, continuous transition from the insulating state to an s-wave superconductor, offering new routes to high-temperature superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity

Background:

  • A quantum spin Hall insulating state exhibits unique properties, including charge 2e skyrmion textures.
  • Spontaneous symmetry breaking drives this insulating state.
  • Doping presents a potential pathway to superconductivity in such materials.

Purpose of the Study:

  • To investigate the emergence of superconductivity via skyrmion condensation in a doped quantum spin Hall insulator.
  • To model and simulate the doping-induced transition to superconductivity.
  • To explore novel routes to superconductivity beyond conventional mechanisms.

Main Methods:

  • Development of a theoretical model suitable for large-scale simulations.
  • Application of negative sign-free quantum Monte Carlo simulations.
  • Analysis of the doping-induced phase transition at high resolution (down to δ=0.0017).

Main Results:

  • Evidence supporting a direct and continuous doping-induced transition.
  • Observation of a transition from a quantum spin Hall insulator to an s-wave superconductor.
  • Successful simulation of low-doping regimes.

Conclusions:

  • Skyrmion condensation offers a viable route to induce superconductivity in quantum spin Hall insulators.
  • The findings provide a theoretical framework for realizing superconductivity through doping.
  • This work contributes to the ongoing search for novel superconducting states, similar to those explored in twisted bilayer graphene.