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arXiv 2501.11751cond-mat.supr-concond-mat.mes-hall
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量子几何自旋与电荷 Josephson 二极管效应

Quantum-geometric spin and charge Josephson diode effects

Institute of Physics, University of Greifswald(格赖夫斯瓦尔德大学物理研究所)

Niklas L. Schulz, Danilo Nikolić, Matthias Eschrig

AI总结:

提出基于量子几何相位的机制,在非共面自旋织构的超导-铁磁混合结构中实现高效电荷与自旋Josephson二极管效应,并设计了可切换超导电流方向的SQUID器件。

摘要:

我们提出了一种通用机制,用于在具有非共面自旋织构的强自旋极化 superconductor-ferromagnet 混合结构中产生巨大的电荷和自旋 Josephson 二极管效应,该机制以量子几何相位表述。我们给出了产生该效应的必要条件,并展示了与实际应用相关的无序材料的数值结果。我们计算了电荷和自旋二极管的 Josephson 二极管效率,并表明自旋二极管效率可达 100%。最后,我们提出了一种 SQUID 器件,它可以通过反转磁通量,在流经 ferromagnet 的近纯自旋向上和自旋向下的等自旋超导电流之间进行切换。这些发现确立了共面自旋织构所不具备的功能。

英文摘要:

We present a general mechanism for large charge and spin Josephson diode effects in strongly spin-polarized superconductor-ferromagnet hybrid structures with a noncoplanar spin texture, formulated in terms of quantum-geometric phases. We present necessary conditions for this effect to occur, and show numerical results for disordered materials, relevant for applications. We calculate Josephson diode efficiencies for both charge- and spin-diodes and show that a spin-diode efficiency of 100% can be reached. Finally, we present a SQUID device that can switch between nearly pure spin-up and spin-down equal-spin supercurrents across the ferromagnet by reversing the flux. These findings establish functionalities that are absent for coplanar spin textures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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