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

这笔仪器资金将支持为ARPES-STM组合系统购买低温超高压设施，用于新材料的研究和教育。STM和ARPES的这种独特组合将把获得空间和动量分辨数据的两种强大能力结合在一起。这将有助于首次在许多新材料的同一表面上测量的两种光谱之间进行直接比较，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随着样品的不同而变化。关于这台仪器的拟议研究活动将极大地促进我们对勒廷格液体、莫特物理和新型超导的理解，所有这些都是现代凝聚态物理的重要组成部分。该项目还将对本科生、研究生和博士后的教育产生重大影响，向他们介绍令人兴奋的新材料、尖端技术和基础凝聚态物理。扫描隧道显微镜(STM)通过使用可以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其亚原子空间分辨率的能力。研究材料中电子态的另一个重要探针是角度分辨光电子能谱(ARPES)，它根据样品表面的发射角度或动量来测量光子激发的电子。通过结合这两种互补的技术，人们可以获得关于电子的几乎完整的信息，这些信息决定了材料的性质。这就是我们希望在该仪器奖的支持下实现的目标，该奖项将为我们提供用于ARPES-STM组合系统的低温超高真空设施。利用这个组合系统，我们建议研究许多新材料，包括高温超导体、有机超导体和纳米材料，以加深我们对这些材料的特殊性质的理解。这对基础物理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。

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.