Shape - Composition - Defect Interplay in 2D Transition Metal Dichalcogenides*

We focus on the interplay of the 2D sheet shape via local variations in composition and/or variations in topological defect density through a combination of strain engineering and shape programming. This includes patterning composition and defect profiles via growth on non-flat substrates and patterning profiles via composition patterning. We implement these ideas theoretically and within phase field and finite element method computations. We then explore applications of these ideas to create a diverse set of composition, defect, and shape patterns and programming bilayer twist. We then exploit Janus structures to program bilayer twist and to actuate dynamic shape change.