Dynamics and Correlations in Frustrated Magnets.

受挫磁铁的动力学和相关性。

• 批准号: 2120140
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2120140
• 关键词: Dynamics; Correlations; Frustrated; Magnets.

Frustrated magnets are collective phases of interacting spins. They are prime examples of Correlated Materials displaying a rich variety of phenomena beyond our canonical understanding of symmetry breaking phases characterised by Landau theory as well as local order parameters. In particular, Quantum Spin Liquids (QSL) are characterised by the emergence of fractionalised excitations and topological properties, e.g. ground state degeneracies and topologically protected edge excitations. QSLs are of interest for our fundamental understanding of many-body phases but have also potential for technological application. Despite decades of research there is still no unambiguously identified materials realisation of a QSL. However, the last few years have seen the discovery of several promising candidate systems. Moreover, on the theoretical side a number of exactly soluble model systems have been invented which allow to understand QSL properties on a rigorous level. This thesis aims at bridging the gap between these recent developments in theory and experiments by exploring the dynamical properties of paradigmatic model Hamiltonians. The goal is to gain a better understanding of the underlying correlations of QSLs and to facilitate their diagnosis and characterisation in experiments.

受抑磁体是相互作用的自旋的集体相。它们是关联材料的主要例子，展示了丰富多样的现象，超出了我们对对称性破缺阶段的规范理解，其特征在于朗道理论以及局部序参数。特别是，量子自旋液体（QSL）的特点是出现了分数激发和拓扑性质，例如基态简并和拓扑保护的边缘激发。QSL对我们对多体相的基本理解感兴趣，但也有技术应用的潜力。尽管经过几十年的研究，仍然没有明确确定的材料实现QSL。然而，在过去的几年里，已经发现了几个有前途的候选系统。此外，在理论方面，已经发明了一些完全可解的模型系统，可以在严格的水平上理解QSL的性质。本论文旨在通过研究聚合模型哈密顿量的动力学性质来弥补这些理论和实验之间的差距。我们的目标是更好地了解潜在的相关性QSL，并促进其诊断和表征实验。

项目成果

One-dimensional long-range Falikov-Kimball model: Thermal phase transition and disorder-free localization

一维长程 ​​Falikov-Kimball 模型：热相变和无序局域化

• DOI: 10.1103/physrevb.104.045116
• 发表时间: 2021
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Hodson T