RII Track-4:NSF: Direct and Complete Characterization of Electronic Properties of Materials Under Pressure

RII Track-4：NSF：压力下材料电子特性的直接完整表征

• 批准号: 2327363
• 负责人: Dean Smith
• 金额: $ 21.92万
• 依托单位: University of Nevada Las Vegas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2327363&HistoricalAwards=false
• 关键词: RII; Track; NSF; Direct; Complete

The diamond anvil cell is a powerful tool for probing materials at extreme pressures (thousands to millions of atmospheres), but electronic information that can be extracted from DAC experiments is often limited by the material and geometric constraints of the pressure device itself — the sample is surrounded by millimeters of diamond and inches of steel. Solid-state high harmonic generation spectroscopy (sHHG) is an emerging technique for studying electronic and structural properties of materials which uses ultrafast lasers to excite electrons and optical spectroscopy to probe them, thus providing an all-optical avenue to gleaning detailed electronic information on materials at extreme pressure. This NSF EPSCoR RII Track-4 research project combines high-pressure expertise from the University of Nevada, Las Vegas (UNLV) with world-leading ultrafast spectroscopy capabilities at the University of California, Berkeley (UCB) to deliver a method to measure electronic band structures of materials at extreme pressures directly. The resulting new methodology will provide researchers with a means to directly measure properties materials at high pressure which are currently inferred from accompanying computation, and the project will also expose UNLV students to cutting-edge techniques at a world-leading institution.This NSF EPSCoR Research Infrastructure Improvement Track-4 Research Fellows (RII Track-4) project provides a fellowship to a Research Assistant Professor at UNLV at a critical juncture of their academic career, and support for a graduate student to participate in first-of-their-kind experiments. The focus of this project is the application of solid-state high harmonic generation spectroscopy to materials at extreme high pressures in a diamond anvil cell. The results can be used to construct their electronic band structures — information which is not possible to garner using currently available experimental methodologies. A development of this kind will thus fill a longstanding gap in high-pressure research, and the PI and the host will be poised to apply their new technique to a range of problems, which involve tracking pressure-induced electronic phase transitions and chemical reactions in situ at high pressures. The PI and students will have access to unique and world-leading facilities at the host institution and will aid in further developing those facilities for compatibility with high-pressure experiments. The fellowship will foster a strong tie between UCB and UNLV, a Minority-Serving Institution, Title III Asian American and Native American, Pacific Islander-Serving Institution, and a Title V Hispanic-Serving Institution. This will prove transformative to the career of the junior PI, and to the research infrastructure at UNLV owing to the new expertise which will be made present on its campus.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

金刚石砧池是在极压（数千至数百万个大气压）下探测材料的强大工具，但从 DAC 实验中提取的电子信息通常受到压力装置本身的材料和几何约束的限制 - 样品是固态高次谐波产生光谱（sHHG）是一种研究材料电子和结构特性的新兴技术，它使用超快激光激发电子和光谱来探测它们，该 NSF EPSCoR RII Track-4 研究项目结合了内华达大学拉斯维加斯分校 (UNLV) 的高压专业知识和世界领先的超快光谱能力，从而提供了一种全光学途径来收集有关极压下材料的详细电子信息。加州大学伯克利分校 (UCB) 提供了一种直接测量极压下材料电子能带结构的方法，由此产生的新方法将为研究人员提供一种直接测量高压下材料特性的方法，这些特性目前是从高压下推断的。该项目还将让内华达大学拉斯维加斯分校的学生接触到世界领先机构的尖端技术。该 NSF EPSCoR 研究基础设施改进 Track-4 研究员 (RII Track-4) 项目为以下大学的研究助理教授提供奖学金： UNLV 正处于学术生涯的关键时刻，并支持研究生参与首次同类实验。该项目的重点是固态高次谐波发生光谱在极高压下的材料中的应用。在钻石中结果可用于构建其电子能带结构——使用当前可用的实验方法无法收集的信息因此将填补高压研究以及 PI 和主办方将准备将他们的新技术应用于一系列问题，其中包括跟踪高压下的压力引起的电子相变和原位化学反应，PI和学生将可以使用主办方独特且世界领先的设施。机构并将协助进一步发展这些设施该奖学金将促进 UCB 和 UNLV 之间的紧密联系，这是一个少数族裔服务机构、第三条亚裔美国人和美洲原住民服务机构、第五条西班牙裔服务机构。由于新的专业知识将在其校园中体现，这将为初级 PI 的职业生涯和 UNLV 的研究基础设施带来革命性的证明。该奖项是 NSF 的法定使命，并通过使用基金会的评估进行评估，被认为值得支持。知识分子优点和更广泛的影响审查标准。