Impact of nitrogen doping on the linear and nonlinear terahertz response of graphene

Article

关键词: CHEMICAL-VAPOR-DEPOSITION;    DOPED GRAPHENE;    OPTICAL-PROPERTIES;    TRANSPORT-PROPERTIES;    CHARGE;    CONDUCTIVITY;    CARBON;    PURE;   

DOI  :  10.1103/PhysRevB.104.155402

来源: SCIE

【 摘 要 】

It is well known that impurities play a central role in the linear and nonlinear response of graphene at optical and terahertz frequencies. In this work, we calculate the bands and intraband dipole connection elements for nitrogen-doped monolayer graphene using a density functional tight-binding approach. Employing these results, we calculate the linear and nonlinear response of the doped graphene to terahertz pulses using a density-matrix approach in the length gauge. We present the results for the linear and nonlinear mobility as well as third-harmonic generation in graphene for adsorbed and substitutional nitrogen doping for a variety of doping densities. We show that the conduction bands are more parabolic in graphene structures with substitutional nitrogen doping than for those with adsorbed nitrogen. As a result, substitutional doping has a greater impact on the terahertz mobility and nonlinear response of graphene than adsorbed nitrogen does.

【 授权许可】

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