Size effect of quantum conductance in carbon nanotube Y-Junctions |
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Authors: | Liu Hong |
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Institution: | Physics Department, Nanjing Normal University, Nanjing 210046, China |
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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. |
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Keywords: | single-walled carbon nanotube Y-junction quantum
conductance local density of state |
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