Supercurrent reversal in Zeeman-split Josephson junctions

Shu-Ichiro Suzuki, Yasuhiro Asano, Alexander A. Golubov

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Abstract

We theoretically study the current-phase relation in a Josephson junction comprising the Zeeman-split superconductors (ZSs) and a normal metal (N). We show that at low temperatures the Josephson current in the ZS/N/ZS junctions exhibits a supercurrent reversal at a certain phase difference φc°(0,π). By calculating the spectral Josephson current, we demonstrate that the band splitting due to the Zeeman interaction causes the level crossing in the spectra of the Andreev bound states and the sign reversal of the Josephson current. Additionally, we propose an alternative method to observe the supercurrent reversal. Tuning the Rashba spin-orbit coupling electrically, one can control the critical phase difference φc, eliminating the need for manipulating two magnetizations independently.

Original languageEnglish
Article number144505
JournalPhysical Review B
Volume108
Issue number14
DOIs
Publication statusPublished - 1 Oct 2023

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