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.

由于其独特的特性三维拓扑绝缘子（TIS）和Weyl Semimetals（WSS）在近年来引起了很大的兴趣，因为它们的特殊性杂物和实验性可访问性结合在一起。 最重要的是，它们可能在不同类型的异质结构中作为组件材料发挥重要作用。特别是，与不同类型的有序培养基，尤其是磁性和超导材料的接近效应为几种有趣的新型物理效应提供了途径，这些效果可能导致新的基于旋转的电子成分的发展。您的总体目标是更好地了解强大的三维拓扑拓扑拓扑器和WEYL半晶体中的磁性和电子电子相互作用。众所周知，有效的单粒子理论成功地预测了这些系统的频带结构的主要特征。然而，越来越明显的是，多体效应产生了异常的磁性，并且可能发挥重要作用。我们的主要目标是研究磁化动态，相变和旋转约瑟夫森效应，这是由于接近诱导的磁性（Ferromagnetic（Ferromagnetic and Fermagnetic and antermagnetic and anderogity）在杂种中的互联物或反对者造成的效果，以及涉及杂物的互动或涉及杂物，尤其是涉及到杂物或涉及的东西。 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.特殊的重点将基于pyrochlore带结构的拓扑结膜绝缘子SMB6和Weyl半法进行研究，并具有损坏的时间反转对称性。