Thickness-Dependent Topological Phase Transitions and Evolution of Flat Bands in Rhombohedral Multilayer Graphene from Few-Layer to Bulk Limit: A NanoARPES Study

The electronic structure of rhombohedral multilayer graphene (RMG) undergoes a thickness-dependent topological phase transition, evolving from a 3D generalization of the Su-Schrieffer-Heeger (SSH) model in thin layers to a topological Dirac nodal spiral semimetal (DNSS) in the bulk limit, as revealed by NanoARPES measurements.