Dual-gated hBN/bilayer graphene superlattices and the mapping of the energy gap at the charge neutrality point

We report on transport properties in dual-gated hexagonal boron nitride (hBN)/bilayer graphene (BLG) superlattices. Here, BLG is non-twisted, i.e., plain. This paper focuses on the charge neutrality point (CNP) for a plain BLG quasiparticle. Under a perpendicular magnetic field, transitions between two insulating states at the CNP are detected by varying a displacement field and mapping out the energy gap deduced from the resistance-temperature characteristics and the magnetoresistance. This work opens avenues for exploring the global phase diagram of the hBN/BLG superlattices beyond the CNP.