Raman Spectroscopy of Quantum Spin Systems and Novel Superconductors

量子自旋系统和新型超导体的拉曼光谱

• 批准号: 1104884
• 负责人: Girsh Blumberg
• 金额: $ 36万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1104884&HistoricalAwards=false
• 关键词: Raman; Spectroscopy; Quantum; Spin; Systems

****TECHNICAL ABSTRACT****Coupling between electrons in ''strongly correlated materials'' is associated with many scientifically important and technologically useful phenomena, including superconductivity, ordered charge and spin density phases and quantum magnetism. This project will pursue spectroscopic studies of (1) recently discovered and technologically important superconductors from the iron-pnictide family which demonstrate high transition temperature and high critical fields, (2) other unconventional superconductors with competing ground states, and (3) prototypical low-dimensional quantum spin systems relevant for studying emerging quantum mechanical phenomena in strongly correlated materials. This project will also provide broad training to postdoc and undergraduate students in low-temperature high resolution magneto-optical spectroscopy.****NON-TECHNICAL ABSTRACT****In many newly discovered materials, there is a particularly strong interaction between the electron charges as well as between the magnetic moments leading to new collective behaviors such as superconductivity or various macroscopically long ranged ordered phases of charge and spin distributions. Understanding the unconventional behavior of these materials with strong interactions presents a great intellectual challenge and is critical to developing new technologies. This project will investigate the basic mechanisms responsible for unconventional properties of these strongly interacting materials by scattering light (i.e., "photons") from the materials while tuning the materials' properties through their novel phases by changing temperature and external magnetic fields. The goals of this project are to better understand the conditions responsible for the emerging properties of these materials: (i) explain the origin of superconductivity and other unconventional microscopically ordered phases, (ii) to elucidate how matter behaves under novel environmental conditions, and (iii) to develop new materials with enhanced functional properties. Equally important for the success of the project will be a dedicated effort to recruit talented undergraduate and graduate students into the research group, including students belonging to groups currently underrepresented in science. This project will also provide diverse interactions with leading international scientists and broad training to postdocs and students, and will be used as part of an outreach program to interest K-12 students in the sciences via tours of the advanced laser optical laboratory.

* 技术摘要 *“强关联材料”中电子之间的耦合与许多科学上重要和技术上有用的现象有关，包括超导性、有序电荷和自旋密度相以及量子磁性。该项目将对（1）最近发现的和技术上重要的铁磷族化合物家族超导体进行光谱研究，这些超导体具有高转变温度和高临界场，（2）其他具有竞争基态的非常规超导体，以及（3）与研究强关联材料中新兴量子力学现象相关的原型低维量子自旋系统。该项目还将为博士后和本科生提供低温高分辨率磁光光谱学方面的广泛培训。在许多新发现的材料中，电子电荷之间以及磁矩之间存在特别强的相互作用，导致新的集体行为，例如超导性或电荷和自旋分布的各种宏观长程有序相。了解这些具有强相互作用的材料的非常规行为是一个巨大的智力挑战，对于开发新技术至关重要。本项目将通过散射光（即，“光子”），同时通过改变温度和外部磁场通过其新颖相来调整材料的性质。该项目的目标是更好地理解这些材料的新兴特性的条件：（i）解释超导性和其他非常规微观有序相的起源，（ii）阐明物质在新环境条件下的行为，以及（iii）开发具有增强功能特性的新材料。对于该项目的成功同样重要的是，将致力于招募有才华的本科生和研究生进入研究小组，包括属于目前在科学领域代表性不足的群体的学生。该项目还将提供与领先的国际科学家和广泛的培训博士后和学生的多样化的互动，并将作为一个推广计划的一部分，通过先进的激光光学实验室的图尔斯旅游感兴趣的K-12学生在科学。