Edgy light on graphene may bring new one-way information routers

Graphene has been the focus of intense research in both academic and industrial settings due to its unique electrical conduction properties. As the thinnest material known to man, graphene is essentially two-dimensional and has distinct electronic and photonic properties from conventional 3D materials. Researchers at Purdue University (Todd Van Mechelen, Wenbo Sun and Zubin Jacob) have shown that graphene’s viscous fluid (colliding electrons in solids can behave like fluids) support unidirectional electromagnetic waves on the edge. These “edge waves” are linked to a new topological phase of matter and symbolize a phase transition in the material, not unlike the transition from solid to liquid.

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