Photoemission Study of Strongly Interacting Electron Systems: Cuprates and Beyond

本项目将利用高分辨率角度分辨光电子能谱(ARPES)研究强相互作用电子系统中的多体效应。该计划的一个主要焦点将是高温超导体。然而，其他新材料，如MgB2和C60系列化合物也将被研究。总而言之，这些材料代表着发展新理论概念的巨大挑战，从而为光谱实验在帮助理论发展方面发挥重要作用提供了机会。随着能量和动量分辨率的大幅提高，ARPES非常适合于这项研究，因为它具有测量关键微观参数的独特能力，这些参数往往揭示了深刻的见解。该项目还将通过培训学生和开发高精度的科学工具来产生更广泛的科学和技术影响。电子相互作用强烈的材料展示了许多新的和有趣的现象，包括更高温度的超导和暴露在磁场中时电导率的非常大的变化。有可能这些材料中的一些将被证明对技术有用。这个单独的研究项目将探索在具有强相互作用电子的材料中所看到的现象的普遍性和多样性。理解这些材料和它们所展示的现象一直是一个巨大的挑战。这个项目使用一种名为角度分辨光电子能谱的先进光谱技术，试图增加我们对材料的理解。这一工具使人们有可能深入了解这些有趣的材料中发生的微观过程。事实证明，这项技术有助于增进我们对高温超导体的了解。该项目还将通过培训学生和开发高精度的科学工具产生更广泛的影响。

This project will study many-body effects in strongly interacting electron systems using high-resolution angle-resolved photoemission spectroscopy (ARPES). A major focus of the program will be the high-Tc superconductors. However, other novel materials such as MgB2 and the C60 family of compounds will also be investigated. Together, these materials represent a formidable challenge to develop new theoretical concepts, and thus an opportunity for spectroscopic experiments to play an important role in helping the development of theory. With much improved energy and momentum resolution, ARPES is ideally suited for this investigation due to its unique capability to measure key microscopic parameters that often reveal deep insights. The project will also have broader scientific and technological impact by training students and by developing high precision scientific tools.Materials in which the electrons interact strongly with each other exhibit a number of novel and interesting phenomena, including superconductivity at higher temperatures and a very large change in the electrical conductivity when exposed to a magnetic field. It is possible that some of these materials will prove to be of use to technology. This individual investigator project will explore the universality and the diversity of phenomena seen in materials with strongly interacting electrons. Understanding these materials, and the phenomena they exhibit, has been a formidable challenge. Using an advanced spectroscopic technique called angle resolved photoemission spectroscopy, this project seeks to increase our understanding of the materials. This tool makes it is possible to gain insight into microscopic processes occurring in these interesting materials. The technique has proven useful in increasing our understanding of high temperature superconductors. The project will also have broader impact by training students and by developing high precision scientific tools.