Abstract :
[en] In a multi-branch metallic interconnect we demonstrate the possibility to induce targeted modifications of the material properties by properly selecting the intensity and polarity of the applied current. We illustrate this effect in Y-shape multiterminal devices made of Nb on sapphire for which we show that the superconducting critical current can be lowered in a controlled manner at a preselected junction. We further observe the gradual appearance of Fraunhofer-like critical current oscillations with magnetic field which indicates the gradual modification of a superconducting weak link. This method permits progressive modifications of a hand-picked junction without affecting the neighboring terminals. The proposed approach has the benefit of being inexpensive and requiring conventional electronics. This technique represents a major step toward all-electric control of multiterminal Josephson junctions.
Funding text :
This work was supported by the Fonds de la Recherche Scientifique – FNRS under the grant U.N027.18, the Research Foundation-Flanders (FWO, Belgium), Grant No. G0A0619N and by COST (European Cooperation in Science and Technology) through COST Action CA16218 “NanoCoHybri”. The work of A. V. S. is partially supported by CDR J.0151.19 and EQP U.N027.18 of the F.R.S.-FNRS. This work received support from the European Union’s Horizon 2020 Research and Innovation Programme, under Grant Agreements no. 824109 and 766025.
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