Electrons in superconductors and other quantum states of matter

凝聚态物质：电子结构凝聚态物质：磁性和磁性材料超导是一种状态，在这种状态下，量子力学通常的微观效应是巨大的，在现实世界中具有潜在的极其有用的应用。同样令人着迷的物质量子态在现代凝聚态物理学中也比比皆是。然而，尽管这些系统的理论通常都很发达，但在我们对这些材料中实际发生的事情的实验知识中存在着显著的差距。这个项目的目的是找出电子在这些材料中的作用，在转变到感兴趣的阶段发生的点。在建立基态的关键转折点上发生的是什么？在导电材料中，这一目标的关键是确定费米面，在许多最有趣的系统中，费米面还有待建立。该项目将利用材料生长和提供超高磁场方面的新发展来探索一系列新系统的电子性质，包括铜酸盐、铁基、拓扑和非中心对称超导体，以及其他显示物质量子态的系统。费米面将通过测量磁量子振荡和角度相关的磁阻来确定。电子和磁相互作用强度将通过掺杂和/或施加高压力以及由此引起的所研究的性质变化来调整。实验结果将与现有的理论模型以及在项目过程中开发的模型进行比较。这些实验将在内部和国际设施中进行。

Condensed matter: electronic structureCondensed matter: magnetism and magnetic materialsSuperconductivity is a state in which the usually microscopic effects of quantum mechanics is writ large and has potentially extremely useful real-world applications. Similarly fascinating quantum states of matter abound in modern condensed matter physics. However, while the theories of these systems are often well developed, there are significant gaps in our experimental knowledge about what is actually is happening in these materials. This project aims to figure out what the electrons are doing in these materials at the point at which the transition into the interesting phase occurs. What it is that occurs at the vital tipping point where the ground state is established? Key to this aim in conducting materials is a determination of the Fermi surface, which in many of the most interesting systems is yet to be established. The project will make use of new developments in materials growth and in the provision of ultra-high magnetic fields to explore the electronic properties of a range of novel systems, including cuprate, iron-based, topological and non-centrosymmetric superconductors, as well as other systems that display quantum states of matter. Fermi surfaces will be determined using measurements of magnetic quantum oscillations and angle-dependent magnetoresistance. The electronic and magnetic interaction strengths will be adjusted by doping and/or the application of high-applied pressures and the resulting change in properties investigated. Experimental results will be compared with existing theoretical models as well as those developed during the course of the project. The experiments will performed in-house and at international facilities.