Dynamic rotation of monolayer van der Walls heterostructures

Emerging at a twist angle of around 1.1 degrees, the flat band dispersion of twisted bilayer graphene (tBLG) provides an exciting means of studying the physics of strongly correlated states. These strong correlations have recently been shown in a number of studies to give rise to superconducting and correlated insulating states as well as anomalous Hall effects. However, the physics of these states is highly sensitive to slight changes in the twist angle away from the so called ‘magic angle’. We report on a new technique for fabricating twisted bilayer graphene devices using an Atomic Force Microscope to control this angle with a high degree of precision. Techniques that enable monolayers to be rotated to arbitrary angles while also preventing the twist angle from relaxing to the Bernal stacking phase will be discussed.