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Multi-Stable Conductance States in Metallic Double-Walled Carbon Nanotubes

Author(s): Tang Dongsheng | Wang Yong | Yuan Huajun | Ci Lijie | Zhou Weiya | Xie Sishen

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 4;
Issue: 6;
Start page: 538;
Date: 2009;
Original page

Keywords: Carbon nanotube | Electrical transport property | Intertube interaction

Abstract 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.

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