Chemical, Electrochemical, and Strain Modifications of Two-Dimensional Layers and Heterostructures

Van der Waals materials possess manifold degrees of freedom for structural and chemical modifcation that make the electronic properties of these two-dimensional (2D) crystals uniquely manipulable. These include the possibilities of dimensionality (# of layers), heterostructures, azimuthal misorientation (twist angle) and intercalation. In this talk, I will discuss various approaches to chemically and electrochemically control the physics of vdW crystals and heterostructures to produce novel 2D magnets, as well as new electron imaging approaches for quantitatively mapping lattice relaxation and resultant intrinsic strain in moiré superlattices of twisted bilayer graphene and transition metal dichalcogenides.