Investigations of magnetic and topological systems using electronic structure and muon-spin spectroscopy

使用电子结构和μ子自旋光谱研究磁性和拓扑系统

• 批准号: 2748010
• 金额: --
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2748010
• 关键词: Investigations; magnetic; topological; systems; using

Topology is an organising principle in condensed matterphysics, allowing us to understand a variety of states of matter andtheir excitations. In magnetism, topology describes defects such as domainwalls, vortices and skyrmions and a variety of exotic groundstates and bandstructures.This project involves the application of electronic structuremethods to understand the underlying electronic configuration oftopological systems, their energy levels and magnetism. These methods will becombined with measurements using implanted muons to sensitively probe the magneticproperties of the materials. Muons are subatomic particles which canbe used as microscopic magnetometers, capable of measuring theordered magnetism and dynamics in magnetic systems. We plan to investigate a range of systems using this approach,including low-dimensional molecular materials, where interactions can betuned by chemical means to stabilize topological states;skyrmion-hosting systems where the dynamics caused by magneticfluctuations are key to understanding their properties; and magnetic Weylsemimetals, where bandstructure considerations determine the systems'exotic physical features. Our approach will also allow us to asses thenature of the muon's stopping state in these systems and evaluatequantum effects driven by zero-point motion, that are usually ignoredin these sorts of investigations.

拓扑是凝聚态物理学中的一种组织原理，使我们能够理解物质的各种状态及其激发。在磁性中，拓扑描述了畴壁、涡旋和斯格明子等缺陷以及各种奇异的基态和能带结构。该项目涉及应用电子结构方法来了解拓扑系统的底层电子配置、其能级和磁性。这些方法将与使用植入μ子的测量相结合，以灵敏地探测材料的磁性。 μ子是亚原子粒子，可用作微观磁力计，能够测量磁系统中的有序磁性和动力学。我们计划使用这种方法研究一系列系统，包括低维分子材料，其中相互作用可以通过化学手段调节以稳定拓扑状态；斯格明子宿主系统，其中由磁涨落引起的动力学是理解其性质的关键；和磁性韦尔半金属，其中能带结构的考虑决定了系统的奇异物理特征。我们的方法还将使我们能够评估这些系统中μ子停止状态的性质，并评估由零点运动驱动的量子效应，这些效应在此类研究中通常被忽略。