Critical Current 0- Transition in Designed Josephson Quantum Dot Junctions

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• 作者：H. Ingerslev J//pubs.acs.org/images/gifchars/oslash.gif" border="0">rgensen ; T. Novotn//pubs.acs.org/images/entities/yacute.gif" border="0"> ; K. Grove-Rasmussen ; K. Flens
• 刊名：Nano Letters
• 出版年：2007
• 出版时间：August 2007
• 年：2007
• 卷：7
• 期：8
• 页码：2441 - 2445
• 全文大小：2169K
• 年卷期：v.7,no.8(August 2007)
• ISSN：1530-6992

文摘

We report on quantum dot based Josephson junctions designed specifically for measuring the supercurrent. From high-accuracy fitting of thecurrent-voltage characteristics, we determine the full magnitude of the supercurrent (critical current). Strong gate modulation of the criticalcurrent is observed through several consecutive Coulomb blockade oscillations. The critical current crosses zero close to, but not at, resonancedue to the so-called 0- transition in agreement with a simple theoretical model.