Topological insulators are one of the most puzzling quantum materials—a class of materials whose electrons cooperate in surprising ways to produce unexpected properties. The edges of a TI are electron superhighways where electrons flow with no loss, ignoring any impurities or other obstacles in their path, while the bulk of the material blocks electron flow.
Click here for original story, A new hands-off probe uses light to explore electron behavior in a topological insulator
Source: Phys.org