IDs:

171

Authors : Tapasztó,L;Márk,G,I;Gyulai,J;Lambin,Ph;Kónya,Z;Biró,L,P
Title : Geometrical effects of wave functions of carbon nanosystems
BookTitle : Electronic Properties of Novel Materials -- Molecular Nanostructures, 8 - 15. March 2003, Kirchberg, Austria
Editors : Kuzmany,Hans;Fink,Jörg;Mehring,Michael;Roth,Siegmar
PubDateYear : 2003
PubDateOther :
Volume : 685
Series : AIP Conference Proceedings
StartPage : 439
EndPage : 442
Publisher : American Institute of Physics
Address : Melville, New York
ISBN :
Keywords : TOP_Tunnel;W_Theory;W_Nanotube;W_Schroed;W_STM;W_2DTunnel
Notes :
Abstract : Networks built from carbon nanostructures and in particular from nanotubes promise exciting nanoelectronic applications. It is thus important to fully understand the quantum mechanical rules of charge propagation through these nanostructures. Some features of the electronic properties of nanosystems are of purely geometrical origin. These can be investigated in the framework of the jellium model [1]. Wave packet dynamical calculations showed [2] that, when the current is tunneling in a transversal directionthrough a carbon nanotube "sandwiched" between two electrodes, the energy dependence of tunneling probability shows a plateau in a well defined range. In this work, by analytically solving the stationary Schroedinger equation of a model system, we demonstrate that this plateau is due to electron being trapped on stationary states of the nanotube. Geometrical features of the wave functions of model potentials corresponding to single and double wall nanotubes are studied. Comparison of the results of the widely used zone folding technique with exact jellium wave functions show an excellent agreement for nanotube diameter d > 1 nm . For double wall nanotubes a considerable amount of current is found to flow through the inner tube [3] in a transversal tunneling situation.
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