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

Feng Chen; Wen O. Wang; Jia-Xin Zhang; Leon Balents; D. N. Sheng

doi:10.1103/tm9q-w5y7

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

Feng Chen, Wen O. Wang, Jia-Xin Zhang, Leon Balents, D. N. Sheng

DOI 10.1103/tm9q-w5y7 · Physical Review Letters

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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.