Coexistence of Superconductivity and Chern insulators with |C| ≥ 1 in twisted rhombohedral bilayer-trilayer graphene

@misc{yang2026coexistence,
  title = {{Coexistence of Superconductivity and Chern insulators with |C| $\geq 1$ in twisted rhombohedral bilayer-trilayer graphene}},
  author = {Qiu Yang and Zihao Huo and Le Liu and Tianqi Song and Fankun Wang and Jingwei Dong and Kenji Watanabe and Takashi Taniguchi and Weibo Gao and Xiaobo Lu and Guangyu Zhang and Wei Yang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.40170},
  eprint = {2610.40170},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.40170},
  note = {CC BY-NC-ND 4.0},
}

TY  - UNPB
TI  - Coexistence of Superconductivity and Chern insulators with |C| ≥ 1 in twisted rhombohedral bilayer-trilayer graphene
AU  - Qiu Yang
AU  - Zihao Huo
AU  - Le Liu
AU  - Tianqi Song
AU  - Fankun Wang
AU  - Jingwei Dong
AU  - Kenji Watanabe
AU  - Takashi Taniguchi
AU  - Weibo Gao
AU  - Xiaobo Lu
AU  - Guangyu Zhang
AU  - Wei Yang
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.40170
UR  - https://arxiv.org/abs/2610.40170
AB  - Rhombohedral multilayer graphene (RMG) has been demonstrated as a promising platform for investigating strongly correlated phases of matter. Here, we observe a coexistence of superconductivity and Chern insulators in a twisted rhombohedral bilayer-trilayer graphene moiré superlattice. Superconductivity, evidenced by a sharp transition with a critical temperature of ~180 mK, nonlinear I-V with a BKT temperature of 135 mK, and a signature of phase-sensitive interference patterns, emerges from a symmetry-breaking Fermi surface near v = -2 and D = 0, and it survives at a large in-plane magnetic field up to 2 T, strongly deviating from the Pauli limit. Moreover, we observe a strong modulation of the Ginzburg-Landau coherence length from 467 nm to 145 nm as the in-plane magnetic field increases from 0 to 2 T, whereas the critical current Ic barely changes. Unlike previous studies in RMG, we observe a competition between superconductivity and a correlated insulator at v = -2, monitored by displacement fields and twist angles. Note that we also observe integer Chern insulators with C = 1, 3, and -3 at v = 1/2, 1, and 3, respectively, for large D > 0 in the same superconducting device. The observations establish twisted rhombohedral graphene multilayers as a fascinating system to investigate unconventional superconductivity, high Chern number topology, and their interplay.
ER  -