Fig. 5: Synthesis of the (LaSe)(NbSe2) heterostructure.

a PXRD patterns and b HAADF-STEM images of (LaSe)(NbSe2) obtained by ball milling LaSe and NbSe2 for 12 h; c the HAADF-STEM image of the annealed material. An NbSe2–NbSe2 double layer is recognized in the lower right-hand corner of the image. Insets: enhanced atomic-scale views of 3D heterostructural arrangements. Scale bars, 5 nm.