Electronic Structure of Quantum Materials

量子材料展示了奇特的效应，人们普遍预计这将支持各种技术的革命性进步，包括高性能电池和超级电容器、可扩展的量子计算机、用于改进传统计算机微处理器和内存的新型体系结构、用于增强电网和高速运输的超导体、用于高分辨率成像大脑活动的超灵敏磁传感器等等。解释这些效应是困难的，因为它们产生于电子之间的复杂关联，不能从单个电子的行为来理解。目前先进的光谱工具，如扫描隧道显微镜(STM)和角度分辨光电子能谱(ARPES)，可以单独探测电子，并且只产生有关电子关联的间接信息。为了解决这一关键差距，我们将使用一种世界上第一种直接探测电子关联的新技术来研究量子材料：符合双电子角度分辨光电子能谱(2E-ARPES)。这种方法独特地将符合电子对探测与高动量、能量和动态时间分辨率结合在一起。具体地说，为了实现预期的科学突破，该研究计划将针对四个研究主题：(1)铜酸盐超导体和电荷密度波系统；(2)多带铁基超导体；(3)量子物质的光学剪裁；(4)拓扑绝缘体中的Majorana模。我们的目标是，通过这一研究计划开发的知识可能会使我们能够精确地设计量子材料并优化其性质，作为下一代技术的基础。对量子材料的物理和应用的前所未有的见解-使我们能够更充分地了解新兴现象并利用它们形成新的技术能力-将把UBC和加拿大推向这一令人兴奋和快速增长的领域的前沿。

Quantum materials exhibit exotic effects widely expected to underpin revolutionary advances across diverse technologies, including high performance batteries and supercapacitors, scalable quantum computers, novel architectures to improve conventional computer microprocessors and memory, superconductors to enhance the electrical grid and high-speed transportation, ultra-sensitive magnetic sensors to image brain activity with high resolution, and many others. Elucidating these effects is difficult because they emerge from complex correlations between electrons and cannot be understood in terms of the behaviour of individual electrons. Current advanced spectroscopic tools such as scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES) interrogate electrons individually and yield only indirect information about electron correlations. To address this critical gap, we will study quantum materials with a novel technique - the first of its kind in the world - to directly probe electron correlations: coincidence two-electron angle-resolved photoemission spectroscopy (2e-ARPES). This approach uniquely combines coincidence electron-pair detection with high momentum-, energy-, and dynamic time-resolution. Specifically, to achieve the anticipated scientific breakthroughs, the research program will target four research themes: (1) cuprate superconductors and charge density waves systems; (2) multi-band iron-based superconductors; (3) optical tailoring of quantum matter; and (4) Majorana modes in topological insulators. The goal is that the knowledge developed through this research program may allow us to precisely engineer quantum materials and optimize their properties to serve as the foundation for next-generation technologies.The unprecedented insights into the physics and application of quantum materials - allowing us to more fully understand the emergent phenomena and harness them into new technological capabilities - will advance UBC and Canada to the very forefront of this exciting and rapidly growing field.