MRI: Acquisition of Cryogenic UHV Facilities for a Combined ARPES-STM System for Research and Education of Novel Materials

MRI：为新材料研究和教育的组合 ARPES-STM 系统采购低温特高压设施

• 批准号: 0421017
• 负责人: Hong Ding
• 金额: $ 12.6万
• 依托单位: Boston College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0421017&HistoricalAwards=false
• 关键词: MRI; Acquisition; Cryogenic; UHV; Facilities

This instrumentation funding will support the acquisition of cryogenic UHV facilities for a combined ARPES-STM system for research and education of novel materials. This unique combination of STM and ARPES will unite the two powerful capabilities of obtaining spatial and momentum resolved data. It will facilitate for the first time a direct comparison between the two spectroscopies measured on the same surface of many novel materials, including high-TC superconductors, organic superconductors, and nano-materials, whose surface can easily vary from sample to sample. The proposed research activities on this instrument will advance significantly our understanding of Luttinger liquids, Mott physics, and novel superconductivity, all of which are the essential parts of modern condensed matter physics. This project will also make a significant impact on the education of undergraduate, graduate students, and post-docs by introducing them to exciting new materials, cutting-edge techniques, and fundamental condensed matter physics.A scanning tunneling microscope (STM) probes atomic structure and local electron density by using a sharp metallic tip that can be positioned close to the surface of a material. Its powerful capability comes from its capacity for sub-atomic spatial resolution. Another important probe to study electronic states in materials is angle-resolved photoelectron spectroscopy (ARPES), which measures photon-excited electrons from a sample surface according to their emission angles, or momenta. By combining these two complementary techniques, one can obtain almost complete information about electrons which determine the properties of a material. This is what we want to achieve with the support of this instrumentation award, which will provide us cryogenic ultra-high vacuum facilities for a combined ARPES-STM system. Using this combined system, we propose to study many novel materials, including high-TC superconductors, organic superconductors, and nano-materials, in order to advance our understanding of the unusual properties of these materials. This is important both for fundamental physics as well as for potential applications. This project will also make a significant impact on education of students by introducing them to exciting new materials, cutting-edge techniques, and basic science.

这笔仪器资金将用于购买低温特高压设备，用于新材料的研究和教育的ARPES-STM组合系统。这种独特的STM和ARPES的组合将结合两种强大的能力，获得空间和动量分辨数据。这将有助于首次直接比较在许多新材料的相同表面上测量的两种光谱，包括高tc超导体、有机超导体和纳米材料，这些材料的表面很容易因样品而异。该仪器的研究活动将大大促进我们对卢廷格液体、莫特物理和新型超导的理解，这些都是现代凝聚态物理的重要组成部分。该项目还将通过向本科生、研究生和博士后介绍令人兴奋的新材料、尖端技术和基础凝聚态物理，对他们的教育产生重大影响。扫描隧道显微镜（STM）通过使用靠近材料表面的尖锐金属尖端来探测原子结构和局部电子密度。其强大的能力来自于亚原子空间分辨率的能力。另一个研究材料中电子态的重要探针是角度分辨光电子能谱（ARPES），它根据发射角度或动量测量样品表面的光子激发电子。通过结合这两种互补的技术，人们可以获得关于决定材料性质的电子的几乎完整的信息。这就是我们希望在该仪器合同的支持下实现的目标，该合同将为我们提供用于组合ARPES-STM系统的低温超高真空设备。利用这个组合系统，我们建议研究许多新材料，包括高tc超导体，有机超导体和纳米材料，以促进我们对这些材料的不同寻常性质的理解。这对基础物理学和潜在的应用都很重要。该项目还将通过向学生介绍令人兴奋的新材料、尖端技术和基础科学，对学生的教育产生重大影响。