Nonsinusoidal current-phase relations in semiconductor-superconductor- ferromagnetic insulator devices

被引：1
作者：
Maiani A. [1 ]
Flensberg K. [1 ]
Leijnse M. [1 ,2 ]
Schrade C. [1 ]
Vaitiekėnas S. [1 ]
Seoane Souto R. [1 ,2 ]
机构：
[1] Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen
[2] Division of Solid State Physics and NanoLund, Lund University, Lund
来源：
Physical Review B | 2023年 / 107卷 / 24期
基金：
英国科研创新办公室; 欧盟地平线“2020”; 欧洲研究理事会;
关键词：
Ferromagnetic materials - Ferromagnetism - Josephson junction devices - Magnetization - Quantum optics - Semiconductor junctions - Superconducting materials;
D O I：
10.1103/PhysRevB.107.245415
中图分类号：
学科分类号：
摘要：
Coherent tunneling processes of multiple Cooper pairs across a Josephson junction give rise to high harmonics in the current phase relation. In this work, we propose and study Josephson junctions based on semiconductor-superconductor-ferromagnetic insulator heterostructures to engineer nonsinusoidal current-phase relations. The gate-tunability of the charge carriers' density in the semiconductor, together with the adjustable magnetization of the ferromagnetic insulator, provides control over the content of the supercurrent harmonics. At finite exchange field, hybrid junctions can undergo a 0 - π phase transition, resulting in a supercurrent reversal. Close to the transition, single-pair tunneling is suppressed and the current-phase relation is dominated by the second-harmonic, indicating transport primarily by pairs of Cooper pairs. Finally, we demonstrate that noncollinear magnetization or spin-orbit coupling in the leads and the junction can lead to a gate-tunable Josephson diode effect with efficiencies of up to ∼30%. © 2023 authors. Published by the American Physical Society.
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