dc Josephson effect in metallic single-walled carbon nanotubes
- 作者：Stefano Pugnetti ; Fabrizio Dolcini ; Rosario Fazio
- 关键词：A. Nanotubes ; C. Scanning and transmission electron microscopy ; D. Josephson effect ; D. Luttinger liquids
- 刊名：Solid State Communications
- 出版年：2007
- 期刊代码：101_00381098
- 类别：ms
- 出版时间：December 2007
- 卷：144
- 期：12
- 页码：551-556
- 文件大小：472 K
摘要
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 l25">le="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6TVW-4P7FSG4-3&_mathId=mml25&_user=10&_cdi=5545&_rdoc=13&_acct=C000050221&_version=1&_userid=10&md5=85c8cf249bc771cf39a99249531d2240" title="Click to view the MathML source">π-junction.