Figure 1
Cross-sectional HAADF-STEM images of (PbSe)1.14(NbSe2)n ferecrystals.
(a) The layer structure is shown on the atomic scale for n = 1. A NbSe2 monolayer (ML) is indicated by a white bar and a PbSe atomic bilayer (BL) is indicated by a black bar. (b) HAADF-STEM image of n = 3. (c) High-resolution HAADF-STEM image of n = 3 showing single atomic columns, which are in accordance with the projection of 2H-NbSe2 along the [100] direction22 depicting that the Nb atoms are coordinated trigonal prismatically and not octahedrally by Se atoms. The atomic columns resolved in the PbSe layer agree with a projection of bulk PbSe along the [100] direction46.
