Interlayer couplings, Moire patterns, and 2D electronic superlattices in MoS₂/WSe₂ hetero-bilayers.

ABSTRACT: By using direct growth, we create a rotationally aligned MoS₂/WSe₂ hetero-bilayer as a designer van der Waals heterostructure. With rotational alignment, the lattice mismatch leads to a periodic variation of atomic registry between individual van der Waals layers, exhibiting a Moiré pattern with a well-defined periodicity. By combining scanning tunneling microscopy/spectroscopy, transmission electron microscopy, and first-principles calculations, we investigate interlayer coupling as a function of atomic registry. We quantitatively determine the influence of interlayer coupling on the electronic structure of the hetero-bilayer at different critical points. We show that the direct gap semiconductor concept is retained in the bilayer although the valence and conduction

SUBMITTER: Zhang C 

PROVIDER: S-EPMC5218515 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature