Topological Photonic Crystals and Magnetoplasmons
Since the discovery of topological insulators, it has been recognized that topology is indispensable in distinguishing phases of matter. Similarly, new optical material systems are being discovered with non-trivial topologies of wave-functions on their dispersions, whose interfaces support novel states of light completely immune to disorder or imperfection. Similar effects are also being explored for other bosonic particles. In this talk, I will show topological systems of photons, phonons and plasmons with protected transport, due to the same band topologies as the quantum anomalous Hall effects, topological semimetals, topological (crystalline) insulators and p+ip topological superconductors. Specifically, I will discuss single and multimode one-way waveguides, the observation of Weyl points, a nonsymmorphic photonic crystal supporting a single surface Dirac cone, as well as a gyroscopic phononic crystal and topological magnetoplasmons.