Tunable Moiré Superlattice of Artificially Twisted Monolayers.

Twisting between two stacked monolayers modulates periodic potentials and forms the Moire electronic superlattices, which offers an additional degree of freedom to alter material property. Considerable unique observations, including unconventional superconductivity, coupled spin-valley states, and quantized interlayer excitons are correlated to the electronic superlattices but further study requires reliable routes to study the Moire in real space. Scanning tunneling microscopy (STM) is ideal to precisely probe the Moire superlattice and correlate coupled parameters among local electronic structures, strains, defects, and band alignment at atomic scale. Here, a clean route is developed to construct twisted lattices using synthesized monolayers for fundamental studies. Diverse Moire superlattices are predicted and successfully observed with STM at room temperature. Electrical tuning of the Moire superlattice is achieved with stacked TMD on graphite.