电场驱动石墨烯中等离激元诱导的光电导（英文）  

Plasmon-Induced Optical Conductivity of Graphene Driven by an Electric Field

作　　者：赵承祥 徐文[1,2] 

机构地区：[1]中国科学院合肥物质科学研究院材料物理重点实验室,安徽合肥230031 [2]云南大学,云南昆明650091

出　　处：《稀有金属材料与工程》2015年第11期2698-2701,共4页Rare Metal Materials and Engineering

基　　金：Ministry of Science and Technology of China(National Key Scientific Instrument and Equipment Development Projects)(2011YQ130018)

摘　　要：理论研究了电场驱动的石墨烯系统中等离激元诱导的光电导特性。结果发现德鲁德部分主导光电导的低频区而等离激元诱导产生一个相对较小但是在高频区可以观察到的光电导。德鲁德部分和等离激元诱导部分都位于太赫兹光频谱区。德鲁德部分随着入射光频的增加而单调的减小,而等离激元诱导的部分由于等离激元和光的耦合在大约位于1太赫兹处有一个吸收峰。此外发现等离激元诱导光电导与驱动电场以及由门电压调节的电子浓度有很强的依赖关系。结果显示,石墨烯中的光电导不仅可以通过门电压来调控,而且可以通过驱动电场得到进一步的调节。这些理论结果有助于更深入的理解石墨烯的太赫兹等离激元以及光电子学特性。We theoretically investigate the optoelectronic properties of graphene driven by an external DC electric field caused via in-plane source-drain voltage.It is found that the Drude part dominates the optical conductivity in the low-frequency region,whereas the plasmon effect can give rise to a relatively weak but observable the optical conductivity in the high-frequency region.Both the Drude and plasmon-induced parts of optical conductivity can be observed in the terahertz（THz） bandwidth.Drude part decreases monotonously with increasing of the photon frequency,the plasmon-induced part exhibits a peak at about ω~1 THz due to resonant plasmon-photon interaction in graphene.Moreover,we examined the dependence of plasmon-induced optical conductivity on the driving electric field and electron density and find that it depends sensitively on these parameters.It is indicated that the optical conductivity resulted from Drude and plasmon-induced parts in graphene can be tuned efficiently not only by electric gating but also by source-drain voltage.

关 键 词：石墨烯 等离激元 光电导 驱动电场 

分 类 号：O613.71[理学—无机化学]