Further information: The atomically thin sheet of carbon atoms, known as graphene, was the first two-dimensional crystal discovered. It was not, however, the last. In recent years, there has been an explosion in the number of discovered 2D crystals, each possessing their own unique and interesting properties. However, a combinatorially greater potential can be realised by stacking different 2D crystals on top of each other, in a controlled sequence, to create a new artificial layered material. In this talk, I shall describe how even seemingly innocent stacks reveal a rich variety of new physics, and will particularly focus on explaining the theory and maths behind it. Specific examples include the emergence of a fractal pattern of energy bands, the novel Spirograph-like trajectories of electrons in a weak magnetic field, and the geometry of moiré patterns.
Talk begins at 6:30pm, refreshments from 6:00pm.