dc Josephson Effect in Metallic Single-Walled Carbon Nanotubes

Details dc Josephson Effect in Metallic Single-Walled Carbon Nanotubes dc Josephson Effect in Metallic Single-Walled Carbon Nanotubes

2007-02-28

arxiv.org/abs/cond-mat/0702678v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 5 figures

Scientific paper

10.1016/j.ssc.2007.03.055

The dc Josephson effect is investigated in a single-walled metallic carbon nanotube connected to two superconducting leads. In particular, by using the Luttinger liquid theory, we analyze the effects of the electron-electron interaction on the supercurrent. We find that in the long junction limit the strong electronic correlations of the nanotube, together with its peculiar band structure, induce oscillations in the critical current as a function of the junction length and/or the nanotube electron filling. These oscillations represent a signature of the Luttinger liquid physics of the nanotube, for they are absent if the interaction is vanishing. We show that this effect can be exploited to reverse the sign of the supercurrent, realizing a tunable \pi-junction.

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