Fig. 2: Mixed-state electron ptychographic reconstruction of a bilayer MoSe2/WS2 sample.
a Reconstruction from 128 × 128 diffraction patterns with a scan step size of 2.36 Å, field of view of 30 × 30 nm2, and reconstructed pixel size of 0.2 Å, which is close to the pixel size (0.19 Å) in ADF image in c. Scale bar is 5 nm. b Enlarged images from the regions marked by the white rectangular on a and showing the bilayer structure. The white and red arrows point to the atomic pairs for the intensity profiles in e. c Conventional annular dark-field (ADF) image from a similar bilayer area acquired in a focused probe condition using the same aperture size and a similar dose as that for ptychography in a. Scale bars in b and c are 2 nm. d Diffractogram of the whole reconstruction in a, the circulated diffraction spot corresponds to a 0.69 Å distance in real space. Scale bar is 0.7 Å−1. e Line profiles across two atomic pairs pointed by the white and red arrows on b showing atomic column distances of 0.6 and 1.0 Å, respectively.
