How to make topological plasmons in graphene

Patterned graphene should be an ideal material for creating infrared topological plasmons, according to calculations by physicists in the US and China. Dafei Jin, Thomas Christensen and colleagues at the University of California, Berkeley, Massachusetts Institute of Technology and the Institute of Physics of the Chinese Academy of Sciences came to this conclusion after calculating the electronic properties of graphene – a sheet of carbon just one atom thick – patterned with a triangular lattice of circular holes (see figure).