Ultrafast helicity control of surface currents in topological insulators with near-unity fidelity
Ultrafast helicity control of surface currents in topological insulators with near-unity fidelity
Abstract In recent years, a class of solid-state materials, called three-dimensional topological insulators, has emerged. In the bulk, a topological insulator behaves like an ordinary insulator with a band gap. At the surface, conducting gapless states exist showing remarkable properties such as helical Dirac dispersion and suppression of backscattering of …