Quantum 2025 – wissenschaftliches Programm

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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.61: Poster

Montag, 8. September 2025, 18:30–20:30, ZHG Foyer 1. OG

Towards magnetotransport measurements in rhombohedral multi-layer graphene — •David Paul Urbaniak, Christian Eckel, Sirri Batuhan Kalkan, and Thomas Weitz — 1st Institute of Physics, Faculty of Physics, Georg-August University Göttingen, Germany

The flat bandstructure of rhombohedral multilayer graphene enables the investigation of a variety of correlation-driven effects, including the fractional quantum Hall effect and its anomalous counterpart, recently observed in rhombohedral pentalayer graphene [1]. Recent observations have additionally revealed signatures of chiral superconductivity in rhombohedral tetra- and pentalayer graphene, along with the unprecedented discovery of a superconductor phase within an anomalous Hall phase in rhombohedral hexalayer graphene [2, 3]. This work presents the necessary steps for the fabrication of an in hexagonal boron nitride (hBN) encapsulated, dual gated device for the investigation of the aforementioned effects during magnetotransport measurements in the milli Kelvin regime. The fabrication techniques employed consist of Raman spectroscopy, scattering near field optical microscopy (SNOM), a nanolithography technique based on an atomic force microscope (AFM), and a dry transfer technique. Conclusively, preliminary measurements are presented.
[1] Zh. Lu et al., Nature 626, 759 (2024).
[2] T. Han et al., arXiv:2408.15233 (2024).
[3] E. Morissette et al., arXiv:2504.05129 (2025).

Keywords: rhombohedral graphene; correlation effects; SNOM; transport