graphene

3. Graphene ~ relativistic electron system

３. Klein tunneling

(Fig. 4)　　　　　　　　　　　　(Fig. 5)　　　　　　　　　　　　(Fig. 6)

During the tunneling process of the electron in a potential barrier, the amplitude of the wave function evanescently decays in the potential barrier in the case of the non-relativistic electron (Fig. 4).
In contrast, the relativistic electron in the graphene which is vertically injected can transmit the barrier without any decay (Klein tunneling).
Our group is trying to detect the Klein tunneling experimentally using the pn junction in the graphene (Fig. 6).
This system is theoretically predicted to behave as metamaterial for electrons. We are trying to detect this phenomenon.