Dynamic twisting and imaging of moiré crystals

This dataset supports the manuscript "Dynamic twisting and imaging of moiré crystals." It contains the imaging data, extracted parameters, and analysis code from a scanning-probe study of in situ, post-fabrication twist control in moiré superlattices. Using nanostructured metal rotors driven by an AFM tip, the twist angle between stacked 2D layers is continuously tuned and the resulting moiré lattice imaged within the same microscope via piezoresponse force microscopy (PFM). The repository is organized into two top-level directories, Code and Data. The Data directory holds the experimental imaging results for two material platforms, the Graphene rotor and the MoTe₂ rotor. For each platform, raw PFM amplitude images (TIFF/JPEG) are provided alongside the corresponding lattice-site coordinates extracted from those images (coordinate, CSV) and the per-site fit results encoding the local twist angle and heterostrain (fit_result / fit result, CSV). The graphene set additionally includes tapping-mode AFM frames documenting the tip-driven rotation and translation of the rotor. A separate Bandstructure calculation directory contains computed small-twist bilayer graphene band structures at θ = 1.054° for an unstrained case (ε = 0.0) and a heterostrained case (ε = 0.288), stored as HDF5 files with an accompanying plotting notebook. The Code directory provides the Jupyter notebooks used to process the imaging data: routines for triangulating moiré lattice sites to map the local twist angle and heterostrain fields (for both twisted bilayer graphene and MoTe₂), and a unit-cell averaging routine that superimposes the hexagonal moiré cells to enhance signal. Together these data and scripts reproduce the quantitative analysis demonstrating sub-degree twist precision with minimal induced heterostrain across the marginally twisted regime.