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Working paper

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

arxiv.org. cond-mat. Cornell University, 2018. No. 1808.07090.
Bakurskiy S. V., Klenov N. V., Soloviev I. I., Pugach N., Kupriyanov M. Y., Golubov A. A.
We study the peculiarities in current-phase relations (CPR) of the SIsFS junction in the region of 0 to p transition. These CPR consist of two independent branches corresponding to 0− and p− 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 j 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.