Plasmon modes in double-layer biased bilayer graphene

We investigate zero-temperature plasmon modes in a double-layer bilayer graphene structure under a perpendicular electrostatic bias. The numerical results demonstrate that there exist two collective modes which are undamped in the long wavelength limit. The finite potential bias decreases remarkably the plasmon energy in a wide range of wave-vector and makes plasmon branches become Landau damped at a higher wave-vector as compared to unbiased case. We find that the dependence of plasmon dispersions on the system parameters such as the inter-layer separation and carrier density is similar in two cases with and without electrostatic bias.

Automated summary

The study explores zero-temperature plasmon modes in a double-layer bilayer graphene structure under a perpendicular electrostatic bias. Results show the presence of two undamped collective modes in the long wavelength limit, with the finite potential bias significantly decreasing the plasmon energy and causing Landau damping at higher wave-vectors. The dependence of plasmon dispersions on system parameters remains similar with and without electrostatic bias.