Chiral superconductors and competing states across a Lifshitz transition in rhombohedral pentalayer graphene

@misc{zheng2026chiral,
  title = {{Chiral superconductors and competing states across a Lifshitz transition in rhombohedral pentalayer graphene}},
  author = {Chuanqi Zheng and Cheng Xu and Chushan Li and Chenyu Zhang and Zijing Zhang and Kenji Watanabe and Takashi Taniguchi and Hao Yang and Dandan Guan and Liang Liu and Shiyong Wang and Yaoyi Li and Hao Zheng and Canhua Liu and Jinfeng Jia and Shengwei Jiang and Zhiwen Shi and Guorui Chen and Fengcheng Wu and Yang Zhang and Tingxin Li and Xiaoxue Liu},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.29873},
  eprint = {2608.29873},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.29873},
}

TY  - UNPB
TI  - Chiral superconductors and competing states across a Lifshitz transition in rhombohedral pentalayer graphene
AU  - Chuanqi Zheng
AU  - Cheng Xu
AU  - Chushan Li
AU  - Chenyu Zhang
AU  - Zijing Zhang
AU  - Kenji Watanabe
AU  - Takashi Taniguchi
AU  - Hao Yang
AU  - Dandan Guan
AU  - Liang Liu
AU  - Shiyong Wang
AU  - Yaoyi Li
AU  - Hao Zheng
AU  - Canhua Liu
AU  - Jinfeng Jia
AU  - Shengwei Jiang
AU  - Zhiwen Shi
AU  - Guorui Chen
AU  - Fengcheng Wu
AU  - Yang Zhang
AU  - Tingxin Li
AU  - Xiaoxue Liu
PY  - 2026
DA  - 2026/08/30
PB  - arXiv
DO  - 10.48550/arxiv.2608.29873
UR  - https://arxiv.org/abs/2608.29873
AB  - Rhombohedral multilayer graphene hosts a distinctive low-energy electronic structure in which strong Coulomb interactions and nontrivial quantum geometry intertwine to generate exotic quantum states. Recent experiments reported signatures of chiral superconductivity in electron-doped rhombohedral multilayer graphene within the spin- and valley-polarized regime. Here we map the normal-state fermiology surrounding chiral superconductivity in rhombohedral pentalayer graphene. Quantum oscillation measurements reveal an electrically controlled Lifshitz transition between a simply-connected circular quarter-metal Fermi surface and an annular quarter-metal Fermi surface. The Lifshitz boundary itself shifts with perpendicular magnetic field, consistent with the strongly momentum-dependent orbital magnetic moment of the low-energy band. Approaching the transition from either side, the electron effective mass becomes strongly enhanced, implying the formation of a nearly dispersionless band bottom and a strongly reduced kinetic-energy scale. This singular electronic structure produces a regime of exceptionally strong instability in which chiral superconductivity competes with Wigner crystalline phases and reentrant quantum Hall states. In particular, two superconducting regions with signatures of orbital time-reversal-symmetry breaking lie on opposite sides of the Lifshitz boundary and have comparable transition temperatures, yet the annular-side state is suppressed by a substantially smaller perpendicular magnetic field. Our calculation finds comparable chiral pairing tendencies on the two parent Fermi surfaces while producing a much lower orbital-Zeeman pair-breaking scale and an additional finite-momentum pairing tendency for the annular state. These results identify Fermi-surface topology as a key control parameter for chiral superconductivity in rhombohedral graphene.
ER  -