The quantum spin Hall effect and topological insulators

In topological insulators, spin-orbit coupling and time-reversal symmetry combine to form a novel state of matter predicted to have exotic physical properties.Comment: 7 pages, 5 figures, an introduction of the quantum spin Hall effect and topological insulators. For a video introduction of topological insulators, see http://www.youtube.com/watch?v=Qg8Yu-Ju3V