Gate-Controlled Superconducting Proximity Effect in Carbon Nanotubes

作者：Alberto F. Morpurgo, Jing Kong, C. M. Marcus, Hongjie Dai · 发表于：Science · 年份：1999 · DOI：10.1126/science.286.5438.263 · 被引用次数：230 · 研究领域：Graphene research and applications、Carbon Nanotubes in Composites、Quantum and electron transport phenomena

The superconducting proximity effect in single-walled carbon nanotubes connected to niobium electrodes was controlled with the use of nearby gates that tune the niobium-nanotube transparency. At 4.2 kelvin, when the transparency was tuned to be high, a dip in the low-bias differential resistance was observed, indicating a proximity effect mediated by Andreev reflection. When the transparency was tuned to be low, signatures of Andreev reflection disappeared and only tunneling conduction was observed. Below approximately 4 kelvin, a narrow peak in differential resistance around zero bias appeared superimposed on the Andreev dip, probably as a result of electron-electron interaction competing with the proximity effect.