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Quasiparticle dynamics of inhomogeneous superconducting and spin-orbit coupledsystems

非均匀超导和自旋轨道耦合系统的准粒子动力学

基本信息

批准号：
394165369
负责人：
Professor Dr. Götz Seibold
金额：
--
依托单位：
Dipartimento di Fisica
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/394165369?language=en
关键词：
Quasiparticle dynamics inhomogeneous superconducting spin

项目摘要

Within the proposed project we aim to investigate the following topics:(a) Investigation of spectral properties of strongly disordered superconductors. Since several years such systems are in the focus of scientific interest due to the superconducting-insulator transition which may be realized at strong disorder. One finds a segregation of the superconducting state into nanometer size islands where first local pairing is realizedbefore at lower temperatures and depending on the disorder strength a coherent superconducting state may be realized. Within the proposed project we aim to calculate the influence of collective excitations on the spectral properties of these systems and therefore contribute to an understanding of the superconductor-insulator phase transition.(b) Investigations related to spin-charge conversion at oxide interfaces. The observed metallic conductivity between the two band insulators strontium titanate and lanthanum aluminate bears interesting scientific questions but also strong potential for technical applications.These systems are characterized by a strong spin-orbit coupling which makes them suitable for spintronics applications. In fact, recent experiments have demonstrated a large efficiencyfor the conversion of a non-equilibrium spin polarization into an electric current. Our project aims to understand this so-called spin-galvanic at oxide interfaces effect based on a microscopic model. Besides an adequate implementation of the bandstructure and atomic spin-orbit coupling it is also necessary to include the effect of disorder. Our investigations arealso planned to be extended to the spin-Hall effect which describes the conversion of a spin current into an electric current.

在拟议的项目中，我们的目标是调查以下主题：（a）调查的光谱性质的强无序超导体。由于超导-绝缘体转变在强无序下可能实现，近年来这类系统一直是科学界关注的焦点。人们发现超导态分离成纳米尺度的岛，在那里第一个本地配对实现之前，在较低的温度和依赖于无序强度的相干超导态可能会实现。在拟议的项目中，我们的目标是计算集体激发对这些系统光谱特性的影响，从而有助于了解超导体-绝缘体相变。(b)氧化物界面自旋电荷转换之研究。在钛酸锶和铝酸镧这两种能带绝缘体之间观察到的金属导电性，既有有趣的科学问题，也有很强的技术应用潜力。这些系统的特征是强自旋轨道耦合，这使它们适合于自旋电子学应用。事实上，最近的实验已经证明了将非平衡自旋极化转化为电流的高效率。我们的项目旨在了解这种所谓的自旋电流在氧化物界面效应的基础上的微观模型。除了充分考虑能带结构和原子自旋轨道耦合外，还必须考虑无序效应。我们的研究也计划扩展到自旋霍尔效应，它描述了自旋电流到电流的转换。