Spin and magnetic properties of superconducting tunnel junctions

超导隧道结的自旋和磁特性

• 批准号: 454646522
• 负责人: Professor Dr. Jaroslav Fabian
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/454646522?language=en
• 关键词: Spin; magnetic; properties; superconducting; tunnel

Superconducting junctions exhibit fascinating physical phenomena while being essential for modern technology, especially for emerging quantum computing architectures. To allow for additional functionalities, researchers are exploring superconducting junctions comprising magnetic elements and tunnel regions with interfacial spin-orbit fields. The interplay of the two most important spin interactions---exchange and spin-orbit coupling---and the long-range superconducting coherence has already been demonstrated to have signatures in spectroscopy and transport, and is predicted to lead to topological superconductivity harboring Majorana states. We will explore theoretically ramifications of the interplay for multicomponent superconducting magnetic junctions, by performing systematic and comprehensive microscopic calculations of the spectroscopic features and electrical conductance for various classes of junctions, in close cooperation with experiment. The main directions of our studies include i) tunneling magnetoresistance Josephson effect, which involves magnetic bilayers encapsulated by superconducting electrodes, ii) noncollinear magnetic layers generating spin-polarized triplet supercurrents in adjacent superconductors, and iii) Andreev bound state spectroscopy in realistic device geometries.

超导结表现出迷人的物理现象，同时对现代技术至关重要，特别是对于新兴的量子计算架构。为了实现额外的功能，研究人员正在探索超导结，包括磁性元件和具有界面自旋轨道场的隧道区。两个最重要的自旋相互作用-交换和自旋轨道耦合-和长程超导相干性的相互作用已经被证明在光谱和输运中具有特征，并被预测将导致具有Majorana态的拓扑超导性。我们将探索理论上的多组分超导磁结的相互作用的后果，通过执行系统和全面的微观计算的光谱特征和电导的各种类别的结，在密切合作的实验。我们的主要研究方向包括i）隧穿磁电阻约瑟夫森效应，它涉及由超导电极封装的磁性双层，ii）在相邻超导体中产生自旋极化三重态超电流的非共线磁性层，以及iii）实际器件几何结构中的Andreev束缚态光谱。