Quantum 2025 – scientific programme

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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.60: Poster

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

Electronic Phase Diagram of Rhombohedral-Stacked Thin Graphene Layers — •Sirri Batuhan Kalkan, Caroline Scheper, David Urbaniak, Monica Kolek Martinez de Azagra, Isabell Weimer, and Thomas Weitz — I. Institute of Physics, Georg-August University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Twisted bilayer graphene has emerged as a powerful system for studying flat band induced exotic quantum phase transitions, offering valuable insights into quantum phenomena [1]. However, the fixed angle between layers in this system limits the tunability of electronic correlations, prompting researchers to explore alternative approaches. Naturally occurring few-layer graphene systems provide a promising solution, as stacking failures in these systems can result in rhombohedral stacking. This configuration enables continuous control of interactions through external electric fields, offering a versatile platform for studying quantum phase transitions [2-3]. By identifying rhombohedral domains, fabricating devices, and conducting electrical characterization, in this work we discuss its electronic phase diagram that encompasses both superconducting and magnetic phase transitions.
[1] Yuan Cao et al. , Nature 556.7699 (2018): 43
[2] Haoxin Zhou et al., Nature 598.7881 (2021): 434
[3] Tonghang Han et al. , arXiv preprint arXiv:2408.15233 (2024).

Keywords: Rhombohedral Graphene; Quantum Phase Transitions; Superconductivity; Electronic Correlations