Electron waves refract negatively
Graphene subs for metamaterials to elicit backward bending
BENDING ELECTRONS Light refracts, or bends, as it moves from one material to another (top left). It can bend more drastically when exposed to metamaterials (bottom left). Now researchers have achieved the same extreme bending with electrons (right), using graphene covered with gold to focus electrons to a point.
G.-H. Lee, G.-H. Park and H.-J. Lee/Nature Physics 2015; E. Otwell