Critical current 0-π transition in designed josephson quantum dot junctions

被引：131
|
作者：
Jorgensen, H. Ingerslev
Novotny, T.
Grove-Rasmussen, K.
Flensberg, K.
Lindelof, P. E.
机构：
[1] Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, DK-2100 Copenhagen, Denmark
[2] Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Prague 12116, Czech Republic
来源：
NANO LETTERS | 2007年 / 7卷 / 08期
关键词：
D O I：
10.1021/nl071152w
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
We report on quantum dot based Josephson junctions designed specifically for measuring the supercurrent. From high-accuracy fitting of the current-voltage characteristics, we determine the full magnitude of the supercurrent (critical current). Strong gate modulation of the critical current is observed through several consecutive Coulomb blockade oscillations. The critical current crosses zero close to, but not at, resonance due to the so-called 0-pi transition in agreement with a simple theoretical model.
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页码：2441 / 2445
页数：5
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