Caustics due to a negative refractive index in circular graphene p-n junctions.
We show that the wave functions form caustics in circular graphene p-n junctions which in the framework of geometrical optics can be interpreted with a negative refractive index.
Cserti
József
J
Department of Physics of Complex Systems, Eötvös University, H-1117 Budapest, Pázmány Péter sétány 1/A, Hungary.
Pályi
András
A
Péterfalvi
Csaba
C