Tunable layer-contrasting electronic structure in a graphene moiré lattice*

The ability to create artificial superlattices from moiré patterns formed by van der Waals materials opens up a powerful platform to engineer controllable systems to study various problems in condensed matter physics. We identify an interesting asymmetric moiré system consisting of graphene only, by creating distinct moiré potentials on different layers of graphene. Transport data suggests multiple electronic systems with distinct characters coexist, with their interplay tunable by twist angles, temperature, and magnetic field. Such tuning knobs allow for the study of various emergent phenomena.