Fig. 4.

Experimental CBED patterns of graphene–hBN samples. (A) CBED pattern where the direction of fringes indicates that there is almost no relative rotation between the layers, Δf = −5 μm, α = 6.93 mrad, which gives the diameter of the imaged area of about 70 nm. (B) CBED pattern of another sample where the direction of fringes indicates a relative rotation between the layers, β = 2.5°, Δf = −3 μm, and α = 8.023 mrad, which gives the diameter of the imaged area of about 48 nm. (C) CBED pattern of graphene/hBN/graphene heterostructure sample, Δf ≈ 0, α = 8.023 mrad; the diameter of the imaged area is about 1 nm (more information on the distribution of the probing wavefront is provided in SI Appendix). The intensity of the central spot is reduced by a factor of 0.002 in A, 0.1 in B, and 0.005 in C. (Scale bars, 2 nm⁻¹.)