| We have studied the electrical contacts coupling effect on a left lead/central single-walled carbon nanotubes(SWNTs)/right lead system by using the tight binding Green function approach. It is showed that at strong coupling strength between electrical contact and central SWNT, the system behaves as Fabry-Perot electron resonator, which can show distinct quantum conductance oscillations and complicate background as the Fermi energy is driven far from the charge neutrality energy point by the applied gate-voltage Vg, the shape of conductance background is dependent on the contacts coupling strength and the chirality of SWNT. For very weak contacts coupling strength, the system presents well defined resonant peaks, which is the limit of the quantum conductance oscillations. |
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