Fig. 1.
STA bilayer graphene. (A) Optical micrograph showing a single graphene flake, subsequently split into two sections along the dotted line. (B) The first section is detached from the substrate using a hemispherical handle. (C) The second section is detached from the substrate using the same hemispherical handle. The substrate is rotated by a small angle between the two steps. Because the two flakes stem from the same graphene domain, an STA is introduced between the crystal axes of the individual layers. (D) Schematic illustration of the moiré pattern formation as a result of the twist angle between the two layers. (E) Optical micrograph of an STA bilayer graphene sample. (F) G vs. VTG (bottom axis) and n (top axis) measured in an STA bilayer graphene sample at different temperatures.