Transport properties of single-wall carbon nanotube Y junctions

被引:94
作者
Andriotis, AN
Menon, M
Srivastava, D
Chernozatonskii, L
机构
[1] Fdn Res & Technol Hellas, Inst Elect Struct & Laser, Iraklion 71110, Crete, Greece
[2] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
[3] Univ Kentucky, Ctr Computat Sci, Lexington, KY 40506 USA
[4] NASA, Ames Res Ctr, CSC, Moffett Field, CA 94035 USA
[5] Russian Acad Sci, Inst Biochem Phys, Moscow 117977, Russia
关键词
D O I
10.1103/PhysRevB.65.165416
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Quantum conductivity of a wide class of carbon nanotube Y junctions is calculated using an efficient Green's function embedding scheme. Our results indicate that rectification and switching properties of these junctions depend strongly on the symmetry and to a lesser degree on chirality. We find that a zig-zag tube forming the stem of a symmetric Y junction is sufficient to cause perfect rectification across the junction, otherwise the I-V characteristics remain asymmetric with some leakage current for positive bias voltages. For asymmetric Y junction, on the other hand, we find that no rectification at all is possible. We invoke a model calculation involving Y branching in molecules as well as in nanotubes to explain the dependence of rectification on the nature of the geometry at the branching.
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页码:1654161 / 16541613
页数:13
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