Josephson Current through a Metallic Carbon Nanotube in the Conductance-Quantization Regime
Josephson Current through a Metallic Carbon Nanotube in the Conductance-Quantization Regime
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电导量子化体系中通过金属碳纳米管的约瑟夫森电流
DOI：
10.1143/jpsj.73.1111
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发表时间：
2004
影响因子：
1.7
通讯作者：
Y. Takane
中科院分区：
文献类型：
--
作者：
Y. Takane
研究了在温度T下，当散射体的电势范围大于晶格常数时，具有N个导电通道的金属碳纳米管的直流约瑟夫森电流。随着碳纳米管长度的增加，其电导接近量子化值G0=4e2/h，而与N无关。我们的注意力集中在这个电导量子化区域的约瑟夫森临界电流Ic的T依赖关系上。结合松原技术和随机矩阵法计算了表征Ic(T)的热长度ξT。结果表明：\(Xi_{T}=\hbar v_{\Text{F}}/(2\pi N k_{\Text{B}}T)\)(v F：费米速度)。这表明Ic(T)依赖于N，而不是由G0给出的电导与N无关。
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 =4 e 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 \(\xi_{T} = \hbar v_{\text{F}}/(2\pi N k_{\text{B}}T)\) ( v 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 .
影响因子：
8.6
作者：
Bezryadin, A;Verschueren, ARM;Dekker, C
通讯作者：
Dekker, C