Strain-tuning electronic structure and quantum many-body interactions

应变调节电子结构和量子多体相互作用

• 批准号: EP/T02108X/1
• 负责人: Philip King
• 金额: $ 56.76万
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FT02108X%2F1
• 关键词: Strain; tuning; electronic; structure; quantum

Quantum Materials represent a frontier research endeavour. The strong interactions at the heart of their exotic physical properties has made understanding, let alone predicting, their materials properties one of the most profound challenges of modern-day solid state physics and materials chemistry. This problem is not just an intellectual curiosity, however; harnessing control over the collective states that these systems can host, such as superconductivity, metal-insulator transitions, and magnetic orderings, could open new routes to designing fast, energy-efficient, and smart multifunctional technologies, operating using completely different design principles to the Silicon-based logic of today. To progress towards an improved fundamental understanding, and thereby ultimate exploitation, of these systems requires controlled, new, experimental approaches. Here, we propose to develop new capabilities for applying large, reversible, and continuously-tuneable uniaxial pressures in conjunction with angle-resolved photoemission experiments. This promises novel insight into how the electronic structures and many-body interactions of quantum materials evolve when subjected to a particularly clean tuning parameter, which is of fundamental importance to further our understanding of the quantum many-body problem in solids. To this end, we will focus on two key materials systems, the metallic transition-metal dichalcogenides and the layered ruthenate oxides. These are each of enormous current interest in their own right, as potential hosts of topological excitations, as new 2D materials candidates, and as unconventional magnets, and are chosen here to provide important complementary insights into the nature of phase competition, electron-lattice interactions, and strong electronic correlations in solids.

量子材料是一项前沿研究工作。在其奇异的物理性质的核心强相互作用已经取得了理解，更不用说预测，他们的材料性能的现代固态物理和材料化学的最深刻的挑战之一。然而，这个问题不仅仅是一个智力上的好奇心;利用对这些系统可以托管的集体状态的控制，例如超导性，金属-绝缘体转变和磁有序，可以为设计快速，节能和智能的多功能技术开辟新的途径，使用与今天的硅基逻辑完全不同的设计原则。为了进一步加深对这些系统的基本理解，从而最终利用这些系统，需要有控制的、新的、实验性的方法。在这里，我们建议开发新的能力，应用大，可逆的，连续可调的单轴压力结合角度分辨光电发射实验。这预示着新的见解如何电子结构和多体相互作用的量子材料的演变时，受到一个特别干净的调谐参数，这是至关重要的，以进一步了解量子多体问题的固体。为此，我们将集中在两个关键的材料系统，金属过渡金属二硫属化物和层状双碳烯酸盐氧化物。这些都是巨大的当前利益在自己的权利，作为潜在的主机的拓扑激发，作为新的二维材料的候选人，并作为非传统的磁铁，并在这里选择提供重要的互补见解的性质相竞争，电子晶格相互作用，并在固体强电子相关性。

项目成果

Engineering higher order Van Hove singularities in two dimensions: the example of the surface layer of Sr$_2$RuO$_4$

二维工程高阶范霍夫奇点：Sr$_2$RuO$_4$ 表面层的示例

• DOI: 10.48550/arxiv.2310.15331
• 发表时间: 2023
• 作者: Chandrasekaran A