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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 12046
School of Nano Science
  Title:   Topology effects of interface and gate voltage on electrical transport through the CNT/C60/CNT junction using the Green?s function method
  Author(s): 
1 . Ali Asghar Shokri
2 . Sh. Nikzad
  Status:   Published
  Journal: J. Appl. Phys.
  No.:  2
  Vol.:  110
  Year:  2011
  Pages:   8
  Publisher(s):   American Institute of Physics
  Supported by:  IPM
  Abstract:
In this work, we investigate electron transport across a carbon molecular junction consisting of a C60 molecule attached to two semi-infinite metallic open-end CNT leads in the coherent regime. Here, we put emphasis on topology of the molecular-electrode interface and gate voltage, and obtain the electrical transmission through the CNT/C60/CNT structure, using the Green’s function method in the framework of a nearest neighbor tight-binding approximation. To this end, three different ways of coupling C60 fullerene through one, five, and six carbon atoms to the CNT-leads in the direction of the longitudinal axis of the tube have been considered. Also, the current-voltage characteristic is calculated in the Landauer-Büttiker formalism at room temperature. It is shown that the number of contact points between the electrodes and the molecule can play an important role in the electrical transport. Also, the bond dimerization and a gate voltage shift the molecular levels, where by adjusting the related parameters the electron conduction can be controlled. Our results show that the proposed structure gives rise to the resonance states and quasi-bound states (Fano resonances) close to −2.63 eV. These antiresonance states are related to the active region and independent from the coupling strength between the device and the leads. The numerical results may serve as important components of nanocircuits.

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