Nonreciprocal and Topological Plasmonics

Metals, semiconductors, metamaterials, and various two-dimensional materials with plasmonic dispersion exhibit numerous exotic physical effects in the presence of an external bias, for example static magnetic field or electric current. These phenomena range from Faraday rotation light propagating bulk to strong confinement directionality guided modes on surface are a consequence breaking Lorentz reciprocity these systems. The recent introduction relevant concepts topological physics, translated condensed-matter systems photonics, has not only given new perspective some topics by relating certain properties media phenomena, but also led discovery regimes truly unidirectional, backscattering-immune, surface-wave propagation. In this article, we briefly review nonreciprocity topology describe their manifestation materials. Furthermore, use classify discuss different classes existing interfaces