Engineering the Strain and Interlayer Excitons of 2D Materials via Lithographically Engraved Hexagonal Boron Nitride

Strainengineering has quickly emerged as a viable option to modifythe electronic, optical, and magnetic properties of 2D materials.However, it remains challenging to arbitrarily control the strain.Here we show that, by creating atomically flat surface nanostructuresin hexagonal boron nitride, we achieve an arbitrary on-chip controlof both the strain distribution and magnitude on high-quality molybdenumdisulfide. The phonon and exciton emissions are shown to vary in accordancewith our strain field designs, enabling us to write and draw any photoluminescencecolor image in a single chip. Moreover, our strain engineering offersa powerful means to significantly and controllably alter the strengthsand energies of interlayer excitons at room temperature. This methodcan be easily extended to other material systems and offers promisefor functional excitonic devices.