Abstract
AbstractGiant fractional Shapiro steps have been observed in Josephson junction arrays as resulting from magnetic flux quantization in the two-dimensional array. We demonstrate experimentally the appearance of giant fractional Shapiro steps in anisotropic Josephson junction arrays as unambiguous evidence of a skewed current phase relationship. Introducing anisotropy in the array results in a giant collective high frequency response that reflects the properties of a single junction, as evidenced by the observation of a Fraunhofer like magnetic field dependence of the total critical current of the system. The observed phase dynamics can be perfectly captured within an extended resistively shunted Josephson junction model. These results directly indicate the potential of Josephson junction arrays to explore the current phase relation in a very broad frequency range (down to 50 MHz) and in a wide variety of novel link materials exhibiting non-conventional current phase relationships.
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy
Reference50 articles.
1. Kulik, I. O. Macroscopic quantization and the proximity effect in S-N-S junctions, Soviet. J. Exp. Theor. Phys. 30, 944 (1969).
2. Golubov, A. A., Kupriyanov, M. Y. & Il’ichev, E. The current-phase relation in Josephson junctions. Rev. Mod. Phys. 76, 411 (2004).
3. Heikkilä, T. T., Särkkä, J. & Wilhelm, F. K. Supercurrent-carrying density of states in diffusive mesoscopic Josephson weak links. Phys. Rev. B 66, 184513 (2002).
4. Baselmans, J., Morpurgo, A., Van Wees, B. & Klapwijk, T. Reversing the direction of the supercurrent in a controllable Josephson junction. Nature 397, 43 (1999).
5. Van Dam, J. A., Nazarov, Y. V., Bakkers, E. P., De Franceschi, S. & Kouwenhoven, L. P. Supercurrent reversal in quantum dots. Nature 442, 667 (2006).
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献