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

剥离量子材料及其异质结构的微米级时间分辨 ARPES

• 批准号: RTI-2020-00377
• 负责人: Damascelli, Andrea
• 金额: $ 10.13万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693520
• 关键词: Micrometer; scale; time; resolved; ARPES

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.

这项提议是为了购买将我们目前最先进的时间和角度分辨光电子能谱系统的空间分辨率提高到10微米以下所需的设备，以建造世界上第一个这种系统。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世界上第一个这种系统，并将使对包含奇异量子现象的二维(2D)材料异质结构的开创性研究成为凝聚态物理研究的前沿。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传统的强关联超导相的超快驰豫动力学，以及单层和少层过渡金属二卤化物(TMDCs)中的大量相(电荷密度波，量子自旋霍尔绝缘)，如NbSe2和WTe2。*UBC将ARPES(达马塞利)、超快光学(Jones)和2D材料制造技术(Folk)的专业知识整合在量子物质研究所(QMI)的同一栋建筑内，从而处于领导这一新研究工作的独特地位。UBC的QMI目前是达马塞利和琼斯开发的最先进的TR-ARPES系统的所在地，资金来自戈登和贝蒂·摩尔基金会，这是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频率发射必要的高能光子(8-40 eV)来探测2D材料异质结构中的量子现象，只是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。