Thin-film hybrid structures of topological insulators with superconductors and ferromagnets: experiment and theory

拓扑绝缘体与超导体和铁磁体的薄膜混合结构：实验与理论

• 批准号: 314727505
• 负责人: Professor Dr. Thomas Dahm
• 金额: --
• 依托单位: Arbeitsgruppe Theorie der Kondensierten Materie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/314727505?language=en
• 关键词: Thin; film; hybrid; structures; topological

In a joint experimental and theoretical effort we investigate thin-film hybrid structures of topological insulators with ferromagnets or superconductors. We aim to develop techniques to detect and access the topological surface states by tunnelling spectroscopy and proximity effects for device applications in spintronics. On the experimental side we plan to grow insulators, ferromagnets, or superconductors on Bi2Se3, Bi2Te3 and compensated Bi-(Te,Se) thin films. We also plan to investigate new topological materials within the hexaborides and Weyl semimetals. Simple devices are proposed to detect and exploit the spin-orbit coupled nature of the topological surface states. The devices will be characterized by spin-dependent tunnelling spectroscopy, Andreev reflection, and Spin-Hall spectroscopy. The experimental studies will be complemented by theoretical investigations of the devices in order to detect the topological surface states, characterize their properties, and control the spin current flow. The theoretical studies will employ exact diagonalization of tight-binding models for hybrid structures of topological insulators, ferromagnets, and superconductors.

在联合实验和理论工作中，我们研究了拓扑绝缘体与铁磁体或超导体的薄膜混合结构。我们的目标是开发通过隧道光谱和邻近效应来检测和访问拓扑表面状态的技术，用于自旋电子学中的设备应用。在实验方面，我们计划在 Bi2Se3、Bi2Te3 和补偿 Bi-(Te,Se) 薄膜上生长绝缘体、铁磁体或超导体。我们还计划研究六硼化物和韦尔半金属中的新拓扑材料。提出了简单的设备来检测和利用拓扑表面态的自旋轨道耦合性质。这些器件将通过自旋相关隧道光谱、安德烈夫反射和自旋霍尔光谱来表征。实验研究将辅以器件的理论研究，以检测拓扑表面状态、表征其特性并控制自旋电流。理论研究将采用拓扑绝缘体、铁磁体和超导体混合结构紧束缚模型的精确对角化。