High-order superlattices by rolling up van der Waals heterostructures

Two-dimensional (2D) materials and van der Waals (vdW) heterostructures are flexible materials with distinct atomic layers beyond traditional units of lattice-matching requirements. Nevertheless, the 2D van der Waals structures researchers have hitherto explored are limited to relatively simple heterostructures with a small number of blocks. It is exponentially more difficult to prepare high-order vdW superlattices with a myriad of alternating units due to their limited yield and the material damage associated with restacking or synthesis.