Resonant tunneling and enhanced Goos–Hänchen shift in a graphene double velocity barrier structure

• Transmission for Dirac fermions through graphene DVBs exhibits strong resonant tunneling effect.
• The resonant tunneling arises from Fabry–Pérot resonance and leads to oscillated conduction at wide energy range.
• Multi-GH shift peaks with giant magnitudes occur in graphene DVBs without the limits of transmission gap.

Resonant transmission and Goos–Hänchen (GH) shift for Dirac fermion beams tunneling through graphene double velocity barrier structures (DVBs) are investigated theoretically. Analytical and numerical results demonstrate that strong resonant tunneling effect occurs in this structure and is highly dependent on the incident angle and the structure of velocity barriers. The resonant tunneling in graphene DVBs belongs to the Fabry–Pérot resonance and leads to oscillated conduction at wide energy range. It is also found that GH shifts in this structure can be enhanced by the resonant tunneling and multi-GH shift peaks with giant magnitudes can occur at these resonant energy positions. These special properties of GH shifts in graphene DVBs may have good application in lateral manipulation of electron beams and valley or spin beam splitter.

Graphene DVBs exhibits strong resonant tunneling effect and has multi giant GH shift peaks at wide energy range without the limits of transmission gap. Figure optionsDownload as PowerPoint slide