Programme

P.52 -- Poster, VCTP-46

Date: Wednesday, 6 October 2021

Time: 08:30 - 10:00

Dispersion relations in biased bilayer graphene double-layer structures

Nguyen Van Men (1,2) and Nguyen Quoc Khanh (2,3)

(1) An Giang University - VNU HCM; (2) Vietnam National University Ho Chi Minh City; (3) University of Science - VNU HCM

In this paper, we consider the effects of a perpendicular electrostatic bias on the dispersion relations in a double-layer structure consisting of two parallel bilayer graphene sheets. Calculations are done without temperature effects. We observed that there are two undamped collective modes in the system in the long-wavelength limit. In comparison with the unbiased case, the collective excitations in biased systems get the smaller frequency in the small wave vector region and become Landau damped in the higher wave vector area. The numerical calculations also demonstrate that as the inter-layer separation changes, the dispersion relations in the biased system behave similarly to those in the unbiased case.

Presenter: Nguyễn Văn Mện