Magnetic Breakdown and Anomalous Quantum Oscillation in Rhombohedral Tetralayer Graphene
arXiv:2607.27207
The paper studies how magnetic breakdown near Van Hove singularities in electron‑doped rhombohedral tetralayer graphene leads to unusual quantum oscillation patterns, offering a probe of the Fermi‑surface geometry and its connection to chiral superconductivity.
Abstract
We investigate magnetic breakdown near Van Hove singularities (VHSs) in the electron-doped rhombohedral tetralayer graphene, where chiral superconductivity has recently been reported. Using the noninteracting band structure and Kubo formula, we identify anomalous Shubnikov-de Haas effects: Ring-like structures in the Landau fan and anomalous high-frequency peaks in the frequency spectra. These anomalous quantum oscillations can be understood by the reconstruction from magnetic breakdown among three nearby Fermi pockets separated by VHSs. Remarkably, these qualitative anomalous features persist into a stronger-VHS regime, where the semiclassical picture breaks down. The temperature and (weak) disorder dependence of the oscillations are also investigated. Our results establish that the magnetic-breakdown-induced anomalous quantum oscillation provides a general distinctive probe for the underlying Fermi-surface geometry associated with VHSs and may explain the recent quantum oscillation experiment in rhombohedral tetralayer graphene [arXiv:2606.05356].
17 pages, 12 figures