(color online) Schematic views of T-FLGs. (a) Simplest model for perpendicular transport in twisted three-layer graphene. The red and blue regions represent hot and cold heat baths, respectively. (b) Simplest model for parallel transport in twisted bilayer graphene. (c) An initial twisted bilayer graphene with a size of W × L, which is an AB stacking bilayer graphene with rotation angle θ = 0°. The red dot represents the rotation center. Other twisted graphenes can be formed by clockwise rotating the top layer. (d) Twisted bilayer graphene structures with θ = 0°, 15°, 30°, 45°, and 60°, respectively. (e) Top view of a T-FLG with a rotation angle θ. Stacking form between even (or odd) layers is AA, while θ is the rotation angle between even and odd layers. (f) The side view of a T-FLG with a rotation angle θ.