Unraveling the ground state of flat-band ABC-stacked trilayer graphene via quantum transport

Due to its flat electronic bands, rhombohedral (i.e. ABC) trilayer graphene is prone to symmetry broken states. However, it is challenging to access its transport properties experimentally due to the abundance of ABA stacked graphene, the known transition from ABC to ABA stacking under van-der-Waals dry processing or metal contact deposition. Prior to suspension we control the local stacking order of the flakes by near-field imaging to ensure its structural integrity. Here, we discuss our latest quantum transport data on high-quality dual-gated ABC-stacked trilayer graphene. For example, at a temperature of 7mK and magnetic field of down to 0.4 T we see a full lifting of all degeneracies of the lowest Landau level.