Source capture
Authors Sibo Guo, Wei-Xuan Chang, Yi-Zhuang You, Zi-Xiang Li
arXiv / Publisher http://arxiv.org/abs/2601.13108v1
PDF https://arxiv.org/pdf/2601.13108v1
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Research paradigm Theoretical
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Summary

This study employs sign-problem-free quantum Monte Carlo simulations to systematically investigate a bilayer fermionic model with strong interlayer antiferromagnetic exchange coupling and local Hubbard repulsion, which serves as a prototype for realizing the symmetric mass generation (SMG) insulator. The numerically exact results unambiguously demonstrate that robust superconducting pairing emerges upon doping the SMG insulator phase, and the Hubbard repulsion significantly enhances the superconducting order parameter. Given that this model may capture key features of the high-temperature superconductor La3Ni2O7 under high pressure, this work establishes a new paradigm for achieving superconductivity starting from a doped SMG parent state, providing important theoretical guidance for future experimental exploration.

Materials

Methods

  • Sign-problem-free quantum Monte Carlo (QMC) simulations

Keywords

  • symmetric mass generation insulator
  • interlayer antiferromagnetic exchange
  • superconducting pairing
  • hubbard interaction enhancement
  • phase stiffness

Highlights

  • This work establishes a new paradigm for superconductivity arising from a doped SMG parent state and provides key theoretical guidance for future experimental investigations.
  • The absence of the sign problem allows for large-scale QMC simulations to explore finite-temperature properties.

Conclusions

  • Robust superconducting pairing emerges upon doping the symmetric mass generation (SMG) insulator phase.
  • The Hubbard repulsion significantly enhances the superconducting order parameter.
  • The superfluid phase stiffness increases rapidly with doping, confirming the superconducting nature of the doped SMG phase.

Main claims

  • Robust superconducting pairing emerges upon doping the symmetric mass generation (SMG) insulator phase.
    • Evidence: Abstract: 'our numerically exact results unambiguously demonstrate that robust superconducting pairing emerges upon doping the SMG phase'
  • The Hubbard repulsion significantly enhances the superconducting order parameter.
    • Evidence: Abstract: 'the SC order is significantly enhanced by the repulsive Hubbard interaction'

Workflow

  • Model construction
    • Materials: Bilayer fermionic model on square lattice
    • Methods: Interlayer Heisenberg exchange; On-site Hubbard interaction
    • Observations: Model remains sign-problem-free at arbitrary fillings
  • Quantum Monte Carlo simulations — Robust superconductivity arises from doped SMG insulator
    • Materials: Model Hamiltonian
    • Methods: Sign-problem-free QMC; Calculation of SC structure factor and superfluid stiffness
    • Observations: Strong interlayer SC pairing emerges from doped SMG insulator; Hubbard interaction enhances SC