Tang Dongsheng, Wang Yong, Yuan Huajun, Ci Lijie, Zhou Weiya, Xie Sishen
Nanoscale Res Lett. 2009 Feb 27;4(6):538-543. doi: 10.1007/s11671-009-9277-y.
Electrical transport properties of individual metallic double-walled carbon nanotubes (DWCNTs) were measured down to liquid helium temperature, and multi-stable conductance states were found in DWCNTs. At a certain temperature, DWCNTs can switch continuously between two or more electronic states, but below certain temperature, DWCNTs are stable only at one of them. The temperature for switching is always different from tube to tube, and even different from thermal cycle to cycle for the same tube. In addition to thermal activation, gate voltage scanning can also realize such switching among different electronic states. The multi-stable conductance states in metallic DWCNTs can be attributed to different Fermi level or occasional scattering centers induced by different configurations between their inner and outer tubes.
对单个金属双壁碳纳米管（DWCNT）的电输运特性进行了测量，测量温度低至液氦温度，并在DWCNT中发现了多稳态电导状态。在一定温度下，DWCNT可以在两个或更多电子态之间连续切换，但在特定温度以下，DWCNT仅在其中一个态下稳定。切换温度因管而异，甚至同一根管子在不同热循环之间也不同。除了热激活外，栅极电压扫描也可以实现不同电子态之间的这种切换。金属DWCNT中的多稳态电导状态可归因于不同的费米能级或由其内外管之间不同构型引起的偶然散射中心。
