FOS Distinguished Visitor Professor Efthimios Kaxiras, presently the John Hasbrouck Van Vleck Professor of Pure and Applied Physics at Harvard University, visited NUS Physics from 2 to 6 February. His research focuses on the remarkable properties of two-dimensional layered materials, particularly ‘twistronics’—a term introduced by his research group— which originated from the experimental discovery of correlated electron behaviour and superconductivity in twisted bilayer graphene. Since then, a great number of new systems have been observed, consisting of two or more twisted layers and exhibiting a wide range of interesting electronic behaviour.