Electric Control of Polarity in Spin-Orbit Josephson Diode
Junghyun Shin, Jae-Ho Han, Anjali Rathore, Joon Sue Lee, Seung-Bo Shim, Jinwoong Cha, Sunghun Park, Junho Suh
TL;DR
This paper demonstrates electric control of polarity in a Josephson diode through tunable spin-orbit coupling, revealing how local electric fields influence nonreciprocal supercurrents in epitaxial Al-InAs junctions.
Contribution
It provides the first systematic experimental and theoretical analysis of electric field-induced polarity reversal in Josephson diodes via spin-orbit coupling.
Findings
Polarity of Josephson diode can be reversed by electric fields.
Spin-orbit coupling tunability affects nonreciprocal Josephson currents.
Theoretical model confirms the role of Rashba and Dresselhaus couplings.
Abstract
The effect of spin-orbit coupling in a Josephson diode has not been elucidated due to its interplay with the complexity of Josephson devices. Here, we systematically control local electric fields in epitaxial Al-InAs Josephson junctions under in-plane magnetic fields and observe a polarity reversal of the Josephson diode. We interpret this polarity reversal as an effect of field-tunable spin-orbit coupling on nonreciprocal Josephson currents. A theoretical model, accounting for Rashba and Dresselhaus spin-orbit couplings in a planar Josephson junction containing many transverse subbands, aligns with the observed polarity reversal and its dependence on magnetic field. Our finding addresses spin-orbit control in a Josephson diode, enabling manipulation of Josephson harmonics.
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