Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 23: Poster Session: Fundamental Aspects and Model Systems
MON 23.63: Poster
Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG
Parent State Modeling of Correlated and Topological Quantum Phases in Rhombohedral Multilayer Graphene — •Robert Schneider1, David Urbaniak1, Chiho Yoon2, Sirri Batuhan Kalkan1, Fan Zhang2, and Thomas Weitz1 — 11st Physical Institute, Faculty of Physics, University of Göttingen, Göttingen, Germany — 2Department of Physics, University of Texas at Dallas, Richardson, TX, USA
Recently, a number of novel correlated and topological quantum phases in N-layer ABC-stacked graphene systems have been identified. Among them are anomalous Hall crystals with a non-trivial Chern number at vanishing magnetic field (Nature 608, 298-302), as well as chiral p-wave superconducting states that persist to unconventionally high magnetic fields (arXiv: 2408.15233). Even though they are fundamentally many-body quantum phenomena, the theoretical determination of the single-particle bands hosting these quantum phases is important in understanding the interplay between quantum geometry and many-body interactions. Examples of relevant effects are the formation of flat bands, the generation of a tunable band gap, and the possibility of a topological Lifshitz transition due to trigonal warping. This work shows how the parent states of these correlated and topological quantum phases can be accurately modeled using various computational methods including tight-binding models and density functional theory (arXiv: 2502.17555v1). Finally, an outlook into the interpretation of the obtained results for different rhombohedral multilayer graphene systems is presented.
Keywords: Rhombohedral van-der-Waals Materials; Topological Quantum Matter; Correlated Electrons; Unconventional Superconductivity; Theoretical and Computational Physics