Title :
An FDTD Model of Graphene Intraband Conductivity
Author :
Salski, Bartlomiej
Author_Institution :
Inst. of Radioelectron., Warsaw Univ. of Technol., Warsaw, Poland
Abstract :
A novel finite-difference time-domain (FDTD) model of magnetized graphene gyrotropic conductivity is proposed in this paper. The model, derived with the aid of auxiliary differential equations, takes into account intraband electron transitions, which are prevailing over interband conductivity terms up to terahertz frequencies. It is shown on the basis of equivalent circuit representation that a static magnetic bias changes a Drude dispersion characteristic of graphene into an extended Lorentz model supplemented with an additional branch accounting for the induced gyrotropy. The proposed FDTD updated equations are successfully validated with analytical results available in the literature. Computational efficiency of the algorithm is also tested.
Keywords :
band structure; differential equations; electrical conductivity; equivalent circuits; finite difference time-domain analysis; graphene; magnetisation; C; Drude dispersion characteristic; FDTD model; auxiliary differential equations; computational efficiency; equivalent circuit representation; extended Lorentz model; finite-difference time-domain model; graphene intraband conductivity; interband conductivity terms; intraband electron transitions; magnetized graphene gyrotropic conductivity; static magnetic bias changes; terahertz frequencies; Conductivity; Equations; Finite difference methods; Graphene; Integrated circuit modeling; Mathematical model; Time-domain analysis; Computational electromagnetics; finite difference time domain (FDTD); graphene; gyrotropy;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2014.2331620
