"Moiré tuning of transport properties in multilayer graphite"
Moiré systems have attracted attention as a host of correlated states and non-trivial topology, as in the case of magic-angle twisted bilayer graphene. Recently, it has been shown that these moiré tuning capabilities persist in few layer graphene systems, such as in the twisted tri/quadra/penta-layer graphene, twisted mono-bilayer graphene (t1+2), and twisted double bilayer graphene (t2+2). However, a general understanding of how moiré physics emerges in twisted systems beyond the atomically thin limit is lacking. In this work, I will present a systematic study of twisted graphitic thin films as the layer number is increased towards the bulk graphite limit. In the ultra-thin regime, in tM+N devices where M+N≤6, we see evidence for correlated states and non-trivial topology and present a comprehensive model for the ground state ordering of the spontaneously symmetry broken phases. As we further increase the number of layers, we find that moiré reconstruction persists well into the bulk graphite limit. We focus on the case of t1+Z systems, where Z≥6, and find such materials constitute a new class of mixed-dimensional moiré materials, where localized moiré surface states interact with and modify the bulk graphitic states. Our results are potentially generally applicable to other layered semimetals and establish mixed-dimensional moiré systems as an exciting path for future research.
