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Spontaneous broken-symmetry insulator and metals in tetralayer rhombohedral graphene - Nature Nanotechnology
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Interactions among charge carriers in graphene can lead to the spontaneous breaking of multiple degeneracies. When increasing the number of graphene layers following rhombohedral stacking, the dominant role of Coulomb interactions becomes pronounced due to the significant reduction in kinetic energy. In this study, we employ phonon–polariton-assisted near-field infrared imaging to determine the stacking orders of tetralayer graphene devices.
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