Proximity-induced magnetism, electrodynamics, and impurites in topological insulators and Weyl semimetals

拓扑绝缘体和韦尔半金属中的邻近感应磁力、电动力学和杂质

• 批准号: 314938056
• 负责人: Professor Dr. Ilya Eremin
• 金额: --
• 依托单位: Institut für Theoretische Physik III: Theoretische Festkörperphysik
• 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/314938056?language=en
• 关键词: Proximity; induced; magnetism; electrodynamics; impurites

Due its unique properties three-dimensional topological insulators (TIs) and Weyl semimetals (WSs) have generated a lot of interest in recent years because of the combination of their peculiarproperties and experimental accessibility. Most importantly, they are likely to play a major role as component materials in different types of heterostructures. In particular, proximity effect to different types of ordered media, especially magnetic and superconducting materials, provides an avenue to several interesting novel physical effects that may lead to the development of new spin-based electronic components.Our overall goal is to better understand the magnetic properties and the electron-electron interaction in the strong three-dimensional topological insulators and Weyl semimetals. It is well established that effective one-particle theories are successful in predicting the main features of the band structure of these systems. Nevertheless, it becomes increasingly evident that many-body effects yielding unusual magnetic properties are present and could play an important role.Our main objective is to study magnetization dynamics, phase transitions, and spin Josephson effect due to proximity-inducedmagnetic (ferromagnetic and antiferromagnetic) symmetry breaking in heterostructures, which involve topological insulators and/or Weyl semimetal. The main focus willbe on bilayer and trilayer structures with room temperature proximity-induced magnetism, which have been recently realized experimentally.Our further goal is to investigate the role of magnetic and non-magnetic impurities and their interaction with surface and bulk states in TIs and WSs, resulting in the non-trivial quasiparticle intereference patterns of the electronic wave functions. The special emphasis will be put on the study of the presumably topological Kondo insulator, SmB6, and Weyl semimetals based on the pyrochlore band structure with broken time-reversal symmetry.

由于其独特的性质，三维拓扑绝缘体（TI）和韦尔半金属（WS）近年来因其独特的性质和实验可访问性的结合而引起了人们的广泛兴趣。 最重要的是，它们可能作为不同类型异质结构中的组成材料发挥重要作用。特别是，不同类型的有序介质（特别是磁性和超导材料）的邻近效应，为几种有趣的新颖物理效应提供了途径，这些物理效应可能会导致新型自旋电子元件的开发。我们的总体目标是更好地了解磁性强三维拓扑绝缘体和韦尔半金属中的性质和电子-电子相互作用。众所周知，有效的单粒子理论可以成功地预测这些系统能带结构的主要特征。然而，越来越明显的是，产生不寻常磁特性的多体效应是存在的，并且可能发挥重要作用。我们的主要目标是研究由于邻近感应磁（铁磁和反铁磁）引起的磁化动力学、相变和自旋约瑟夫森效应异质结构中的对称性破缺，涉及拓扑绝缘体和/或韦尔半金属。主要重点是具有室温邻近感应磁性的双层和三层结构，这些结构最近已通过实验实现。我们的进一步目标是研究磁性和非磁性杂质的作用及其与 TI 和体中表面和体态的相互作用。 WSs，产生电子波函数的非平凡的准粒子互引用模式。特别重点将放在研究基于时间反转对称性破缺的烧绿石能带结构的推测拓扑近藤绝缘体、SmB6 和 Weyl 半金属。