Proposal for graphene-based coherent buffers and memories

We theoretically show that it is possible to coherently control the group velocity of graphene quasiparticles based on tunable electric field effects in both single layer and bilayer graphene p-n-p waveguides, whereby graphene-based coherent buffers and memories could be proposed. We also find that the essential mechanism for the coherent buffering and trapping of quasiparticles can be attributed to interband tunneling through p-n interfaces.