Critical Current 0−π Transition in Designed Josephson Quantum Dot Junctions
- 18 July 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 7 (8) , 2441-2445
Abstract
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−π transition in agreement with a simple theoretical model.Keywords
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