Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.24: Poster

Mittwoch, 20. März 2024, 18:00–20:30, Poster E

Towards magnetotransport measurements in rhombohedral penta-layer graphene — •David Urbaniak, Christian Eckel, Anna Seiler, and Thomas Weitz — University of Göttingen, Faculty of Physics, 1st Institute of Physics, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Graphene is one of the most studied 2D material to-date. Due to its band structure, rhombohedrally stacked multi-layer graphene has been the subject of recent studies. Notably the discovery of superconductivity in tri-layer graphene attracted significant attention [1]. Penta-layer graphene is currently of particular interest for the study of electron correlation effects due to its high density of state stemming from increased flat bands near the band edge [2, 3]. This work shows how rhombohedrally stacked regions of mechanically exfoliated penta-layer graphene can be identified via Raman spectroscopy and spatially resolved in the nanometer regime by scanning near field optical microscopy (SNOM). Furthermore, a nanolithography technique to isolate such regions using an atomic force microscope (AFM) is presented, as well as the fabrication steps of hexagonal Boron Nitride (hBN) encapsulated dual gated magnetotransport devices and the stability of the rhombohedral stacking order during the fabrication process. Additionally, an outlook on the upcoming magnetotransport measurements in the milli Kelvin regime is discussed.

References: [1] Zhou, Haoxin, et al. Nature 598.7881 (2021): 434-438. [2] Han, Tonghang, et al. Nature 623, 41-47 (2023) [3] Han, Tonghang. et al. Nat. Nanotechnol. (2023)

Keywords: Rhombohedral graphene; Correlated phases; SNOM; Magnetotransport