Electronic compressibility study of moiré-less rhombohedral multilayer graphene

Rhombohedral stacked multilayer graphene system, without any moiré potential, has emerged as an elementary strongly correlated electron system. Appealing phases such as correlated insulators, Stoner magnets, unconventional superconductors, and Wigner crystals have been observed and reproduced experimentally. Here we theoretically study the electronic compressibility of this system at extremely low electron and hole densities. Our results, consistent with experimental observations, provide new understanding and characteristics of these correlated phases.