多壁碳纳米管的太赫兹电磁场响应

Terahertz Electromagnetic Field Response of Multiwall Carbon Nanotubes

采用Floquet散射方法,探讨外加太赫兹高频电磁场辐照下多壁碳纳米管的电子能态密度和重整化电阻.研究发现,在外场辐照场频率一定时,系统电子能态密度随着外场强度的增强先振荡上升后振荡下降,重整化电阻先迅速下降后振荡上升;当外场辐照场强度一定时,系统电子能态密度随着外场频率的增加先迅速上升至某一饱和值,然后缓慢振荡下降,重整化电阻先急剧下降至0.10,附近然后缓慢振荡上升.

Utilizing Floquet scattering method,the paper investigates the electronic density of states（DOS） and renormalized resistance of multiwall carbon nanotubes under the irradiation of the terahertz electromagnetic fields.With the irradiation frequency of the external field remaining unchanged,the system DOS is observed to increase at first and then decrease oscillately,while the renormalized resistance of the system firstly decreases rapidly and then increases osicllately with the increasing irradiation intensity.On the other hand,the situation for the unchanged irradiation intensities is some what different,the system DOS increases quickly to a saturation value and then decreases oscillately and slowly,the renormalized resistance decreases urgently to be nearly 0.10 and then increases slowly.