Condensed Matter Theory
Condensed matter physics is the study of the structure and behaviour of the matter that makes up most of the things which surround us every day. It is not the study of the very small (particle theory) or the very large (astrophysics and cosmology) but of the things in between.
Condensed Matter Theory covers a wide variety of different problems, which involve systems as different as polymers, electrons constrained to move in two dimensions, exotic magnets, multi-component fluids, superconductors, and even populations of infectious or economic agents. We study systems as hard to manufacture as ultraclean semiconductor `sandwiches', or as commonplace as water ice.
Despite this large variety, there is a common thread to our research: we seek to understand the collective behaviour of systems which consist of large numbers of constituent elements. Such collective behaviour often turns out to be very rich and complex.