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arXiv · 1808.07090

Protected 0-pi states in SIsFS junctions for Josephson memory and logic

S. V. Bakurskiy·N. V. Klenov·I. I. Soloviev·N. G. Pugach·M. Yu. Kupriyanov·A. A. Golubov
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Abstract

We study the peculiarities in current-phase relations (CPR) of the SIsFS junction in the region of $0$ to $π$ transition. These CPR consist of two independent branches corresponding to $0-$ and $π-$ states of the contact. We have found that depending on the transparency of the SIs tunnel barrier the decrease of the s-layer thickness leads to transformation of the CPR shape going in the two possible ways: either one of the branches exists only in discrete intervals of the phase difference $φ$ or both branches are sinusoidal but differ in the magnitude of their critical currents. We demonstrate that the difference can be as large as $10\%$ under maintaining superconductivity in the s layer. An applicability of these phenomena for memory and logic application is discussed.

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S. V. Bakurskiy, N. V. Klenov, I. I. Soloviev, N. G. Pugach, M. Yu. Kupriyanov, A. A. Golubov. 2018-08-21. Protected 0-pi states in SIsFS junctions for Josephson memory and logic. https://doi.org/10.1063/1.5045490

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