Micrometer-scale time-resolved ARPES on exfoliated quantum materials and their heterostructures

该提案旨在购买所需设备，以将我们目前最先进的时间和角度分辨光电子能谱（TR-ARPES）系统的空间分辨率提高到10微米以下，以建立全球首个此类系统。这种在微米尺度上进行时间分辨微ARPES（TR-ARPES）测量的新能力将导致全世界第一个此类系统，并将允许在凝聚态物理研究的最前沿对二维（2D）材料异质结构进行突破性研究。特别是，这将使我们能够研究魔角扭曲双层石墨烯器件中非常规的强相关超导相的超快弛豫动力学，以及单层和少层过渡金属二硫属化物（TMDC）（如NbSe 2和WTe 2）中的过多相（电荷密度波，量子自旋霍尔绝缘）。*UBC在领导这项新研究工作方面具有独特的优势，它将ARPES（达马塞利），超快光学（琼斯）和2D材料制造技术（Folk）的专业知识结合在量子物质研究所（QMI）的同一栋大楼内。UBC的QMI目前是Damascelli和Jones开发的最先进的TR-ARPES系统的所在地，该系统的资金代表了戈登和贝蒂摩尔基金会的加拿大科学研究的第一次。这个世界级的超快系统已经能够以高重复率提供必要的高能光子（8-40 eV），以探测2D材料异质结构中的量子现象，并且仅缺乏将激光光斑尺寸聚焦到典型微观样品尺寸所需的设备。

This proposal is for the purchase of equipment required to increase the spatial resolution of our current state-of-the-art time- and angle-resolved photoemission spectroscopy (TR-ARPES) system to less than 10 micrometers, to build the first system of this kind in the whole world. This new capability to perform time-resolved micro-ARPES (TR-ARPES) measurements at the micron-scale will result in the first system of this kind in the whole world, and will allow for ground-breaking studies on two-dimensional (2D) material heterostructures hosting exotic quantum phenomena at the very forefront of condensed matter physics research. In particular, this will allow us to study the ultrafast relaxation dynamics of the unconventional, strongly-correlated superconducting phase in magic angle' twisted bilayer graphene devices, as well as a plethora of phases (charge density wave, quantum spin Hall insulating) hosted in mono- and few-layer transition metal dichalcogenides (TMDCs), such as NbSe2 and WTe2. **********UBC is uniquely positioned to lead this new research effort, by combining expertise in ARPES (Damascelli), ultrafast optics (Jones), and 2D material fabrication techniques (Folk) all within the same building at the Quantum Matter Institute (QMI). The QMI at UBC is currently home to a state-of-the-art TR-ARPES system developed by Damascelli and Jones with funding representing a first for Canadian science research from the Gordon and Betty Moore Foundation. This world-class ultrafast system is already capable of delivering the necessary high-energy photons (8-40 eV) at high repetition rates to probe the quantum phenomena in 2D material heterostructures, and is only lacking the equipment required to focus the laser spot size to the typical microscopic sample dimensions.