Visualizing moire ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe₂ structures.

ABSTRACT: Ferroelectricity, a spontaneous and reversible electric polarization, is found in certain classes of van der Waals (vdW) materials. The discovery of ferroelectricity in twisted vdW layers provides new opportunities to engineer spatially dependent electric and optical properties associated with the configuration of moiré superlattice domains and the network of domain walls. Here, we employ near-field infrared nano-imaging and nano-photocurrent measurements to study ferroelectricity in minimally twisted WSe₂. The ferroelectric domains are visualized through the imaging of the plasmonic response in a graphene monolayer adjacent to the moiré WSe₂ bilayers. Specifically, we find that the ferroelectric polarization in moiré domains is imprinted on the plasmonic response of

SUBMITTER: Zhang S 

PROVIDER: S-EPMC10550968 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature