Josephson Current through a Metallic Carbon Nanotube in the Conductance-Quantization Regime (Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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DC Josephson current through a metallic carbon nanotube with N conducting channels is studied at temperature T when the potential range of scatterers is larger than the lattice constant. With increasing length of the carbon nanotube, its conductance approaches the quantized value G_0=4e^2/h irrespective of N. Our attention is focused on the T-dependence of the Josephson critical current I_C in this conductance-quantization regime. The thermal length ξ_T, which characterizes I_C (T), is calculated by combining the Matsubara technique and the random-matrix approach. It is shown that ξ_T=&plank;υ_F/ (2πNκ_BT) (υ_F : the Fermi velocity). This indicates that I_C(T) depends on N, in contrast to the conductance which is given by G_0 irrespective of N.
社団法人日本物理学会の論文
2004-05-15