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Topological Chiral Superconductivity in the Triangular-Lattice Hofstadter-Hubbard Model

Feng Chen1,2,3,*, Wen O. Wang4,*, Jia-Xin Zhang5,4,†, Leon Balents4,5,6,‡, and D. N. Sheng3,§

  • *These authors contributed equally to this work.
  • †Contact author: zhangjx.phy@gmail.com
  • ‡Contact author: balents@spinsandelectrons.com
  • §Contact author: donna.sheng1@csun.edu
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Phys. Rev. Lett. 136, 086503 – Published 26 February, 2026

DOI: https://doi.org/10.1103/tm9q-w5y7

Abstract

Moiré materials provide exciting platforms for studying the interplay of strong electronic correlation and large magnetic flux effects. We study the lightly doped Hofstadter-Hubbard model on a triangular lattice through the large-scale density matrix renormalization group and determinantal quantum Monte Carlo simulations. We find strong evidence for a robust chiral superconducting (SC) phase with dominant power-law pairing correlations and a quantized spin Chern number. The SC phase emerges at very weak interaction and grows stronger at intermediate interaction strengths (U) for a wide range of hole doping. We also discuss the possible distinct nature of the normal state in different U regimes. Our Letter provides theoretical insights into the emergence of topological superconductivity from doping topological Chern bands or magnetic-flux-induced chiral spin liquid states of Moiré materials.

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Corrections

28 August, 2026

Correction: A support statement in the eighth sentence of the Acknowledgments has been corrected.

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Phys. Rev. Lett. 136, 086503– Published 26 February, 2026
  • Received 10 September 2025
  • Revised 12 January 2026
  • Accepted 2 February 2026
  • Corrected 28 August 2026
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