Sliding-dependent electronic structures of alternating-twist tetralayer graphene

Unlike twisted bilayer graphene (TBG), the electronic structures of alternating-twist tetralayer graphene (ATTG) vary with sliding between layers. Here, the authors model the system as two vertically stacked equal twist angle TBG layers. They specifically explore how three sliding geometries (AA, AB, and SP) affect its electronic and optical properties, including valley Chern numbers. The results of optical conductivity and self-consistent Hartree band structures provide deeper insights into ATTG with various sliding configurations and offer potential experimental fingerprints.