Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Poster Session

TT 22.10: Poster

Wednesday, February 27, 2008, 14:00–18:00, Poster B

Effects of the intershell tunneling in the spectrum of incommensurate DWNTs — •Magdalena Marganska, Shidong Wang, and Milena Grifoni — Institut of Theoretical Physics, University of Regensburg, 93047 Regensburg

In calculations involving multi-wall nanotubes and taking into account the inter-wall coupling, some form of that coupling must be adopted. We study the effects which the choice of a particular expression for the inter-shell electron tunneling has on the calculated electronic spectrum of an incommensurate double-wall carbon nanotube (DWNT). We examine the level statistics and the fractal dimensions of the spectra obtained using different forms of the coupling. The former quantity can determine whether the system is chaotic or regular, the latter may be an indicator of the nature of the transport in the system. We find that the more localized is the tunneling, the more pronounced are the fractal features of the spectrum and the chaotic nature of the system. Therefore when investigating e.g. the transport characteristics in incommensurate DWNTs, different results may be obtained depending on the choice of the inter-shell tunneling.