In situ nanoscale imaging of moire superlattices in twisted van der Waals heterostructures.

ABSTRACT: Direct visualization of nanometer-scale properties of moiré superlattices in van der Waals heterostructure devices is a critically needed diagnostic tool for study of the electronic and optical phenomena induced by the periodic variation of atomic structure in these complex systems. Conventional imaging methods are destructive and insensitive to the buried device geometries, preventing practical inspection. Here we report a versatile scanning probe microscopy employing infrared light for imaging moiré superlattices of twisted bilayers graphene encapsulated by hexagonal boron nitride. We map the pattern using the scattering dynamics of phonon polaritons launched in hexagonal boron nitride capping layers via its interaction with the buried moiré superlattices. We explore the origin of the do

SUBMITTER: Luo Y 

PROVIDER: S-EPMC7442634 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature