Topologically protected Dirac plasmons in a graphene superlattice.

ABSTRACT: Topological optical states exhibit unique immunity to defects, rendering them ideal for photonic applications. A powerful class of such states is based on time-reversal symmetry breaking of the optical response. However, existing proposals either involve sophisticated and bulky structural designs or can only operate in the microwave regime. Here we show a theoretical demonstration for highly confined topologically protected optical states to be realized at infrared frequencies in a simple two-dimensional (2D) material structure-a periodically patterned graphene monolayer-subject to a magnetic field of only 2 tesla. In our graphene honeycomb superlattice structures, plasmons exhibit substantial nonreciprocal behavior at the superlattice junctions under moderate static magnetic fields, leadi

SUBMITTER: Pan D 

PROVIDER: S-EPMC5665919 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature