Size effect of quantum conductance in carbon nanotube Y-Junctions

doi:10.1088/1674-1056/19/5/057206

Abstract This paper studies the quantum conductance properties of three-terminated carbon nanotube Y-junctions, which are built by connecting three (5,5) single-walled carbon nanotubes. The results show that the quantum conductance at the Fermi energy oscillates periodically with the junction's size, and the number of oscillating periodic layers is 3 which is the same as that in the two terminated $(10,0)/m(5,5)/(10,0)$ junctions. Moreover, this Y-junction with different size exhibits obvious different distribution of electron current in the two drain branches, called shunt valve effect of electronic current. Thus the degree of this effect can be controlled and modulated directly by constructing the three branches' sizes or the distribution of defect. The results show in detail that the difference between the two drain currents can be up to two times for some constructions with special sizes. In addition, the uniform distribution of defects in the Y-junction leads to lower quantum conductance than that of other defect configurations.

Keywords: single-walled carbon nanotube Y-junction quantum conductance local density of state

Received: 16 July 2009
Revised: 10 October 2009
Accepted manuscript online:

PACS:	73.63.Fg	(Nanotubes)
	73.22.-f	(Electronic structure of nanoscale materials and related systems)
	71.15.Ap	(Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.))

Fund: Project supported by the Natural Science Foundation of Jiangsu Education Department (Grant No.~04KJB140065) in China.

Cite this article:

Liu Hong(刘红) Size effect of quantum conductance in carbon nanotube Y-Junctions 2010 Chin. Phys. B 19 057206

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