Novel Magnetism in Rhombohedral Pentalayer Graphene: The Superpolarized Electron-Hole Fluid

Recent experimental findings on rhombohedral pentalayer graphene have revealed several fascinating electronic phases. These include ferromagnetic metals characterized by orbital multiferroicity, Chern insulators with large Chern numbers, and the long sought-after fractional quantum anomalous Hall insulators. Based on the experimental data, we propose the existence of an unprecedented magnetic metal, termed the superpolarized electron-hole fluid. This presentation will discuss the characteristics of this unique magnetic phase, elucidate its correlation with the experimental findings in rhombohedral pentalayer graphene, and introduce methodologies to detect this novel phase of matter.