Correlation, Topology, and Superconductivity in Rhombohedral Multilayer Graphene
Date : November 26, 2025 16:00 ~
Speaker : 최영준 (POSTECH 물리학과)
Professor : Prof. Sunghoon Jung, Prof. Joonho Jang, Prof. Yongjoo Baek
Location : 56동105호
Rhombohedral-stacked multilayer graphene provides an exceptional platform for exploring correlated electron phenomena, owing to its flat bands near the Fermi energy and the ability to tune its properties with an external electric field. Its valley-dependent Berry phase further suggests the emergence of topological states when isospin symmetry is broken by electron correlations. In this talk, I will present recent discoveries of novel quantum phases in rhombohedral multilayer graphene, including superconductivity as well as integer and fractional quantum anomalous Hall effects. I will then discuss recent STM measurements that directly visualize intervalley coherent states, offering new insights into the possible origin of superconductivity. These findings open fresh avenues for investigating the interplay between correlation and topology in two-dimensional crystals, with potential implications for realizing topological superconductivity.Rhombohedral-stacked multilayer graphene provides an exceptional platform for exploring correlated electron phenomena, owing to its flat bands near the Fermi energy and the ability to tune its properties with an external electric field. Its valley-dependent Berry phase further suggests the emergence of topological states when isospin symmetry is broken by electron correlations. In this talk, I will present recent discoveries of novel quantum phases in rhombohedral multilayer graphene, including superconductivity as well as integer and fractional quantum anomalous Hall effects. I will then discuss recent STM measurements that directly visualize intervalley coherent states, offering new insights into the possible origin of superconductivity. These findings open fresh avenues for investigating the interplay between correlation and topology in two-dimensional crystals, with potential implications for realizing topological superconductivity.