Sickinger, H., Lipman, A., Weides, M. , Mints, R.G., Kohlstedt, H., Koelle, D., Kleiner, R. and Goldobin, E. (2012) Experimental evidence of a φ Josephson junction. Physical Review Letters, 109(10), 107002. (doi: 10.1103/PhysRevLett.109.107002) (PMID:23005318)
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Abstract
We demonstrate experimentally the existence of Josephson junctions having a doubly degenerate ground state with an average Josephson phase ψ = ± φ . The value of φ can be chosen by design in the interval 0 < φ < π . The junctions used in our experiments are fabricated as 0- π Josephson junctions of moderate normalized length with asymmetric 0 and π regions. We show that (a) these φ Josephson junctions have two critical currents, corresponding to the escape of the phase ψ from − φ and + φ states, (b) the phase ψ can be set to a particular state by tuning an external magnetic field, or (c) by using a proper bias current sweep sequence. The experimental observations are in agreement with previous theoretical predictions.
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Weides, Professor Martin |
Authors: | Sickinger, H., Lipman, A., Weides, M., Mints, R.G., Kohlstedt, H., Koelle, D., Kleiner, R., and Goldobin, E. |
College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
Journal Name: | Physical Review Letters |
Publisher: | American Physical Society |
ISSN: | 0031-9007 |
ISSN (Online): | 1079-7114 |
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