Physics of Strong Disorder and Correlation

强无序与相关物理学

• 批准号: 1522575
• 负责人: Patrick Lee
• 金额: $ 35.4万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1522575&HistoricalAwards=false
• 关键词: Physics; Strong; Disorder; Correlation

NONTECHNICAL SUMMARYThis award supports theoretical research and education in condensed matter physics. The theoretical work takes its inspiration from experimental discovery in new materials and aims to explain and predict novel phenomena. Such novel phenomena often arise in materials where electrons are strongly interacting with each other, and this work will focus on this rich arena. Past examples include Nobel winning discoveries such as the fractional quantum Hall effect and high temperature superconductivity. The current project involves studies of a novel state of matter called quantum spin liquid, as well as the theory behind high temperature superconductivity. This research area is particularly well suited for the training of graduate students and postdoctoral fellows because both mathematical sophistication and an understanding of real materials are required to make progress. TECHNICAL SUMMARYThis award supports theoretical research and education in condensed matter physics. Strong correlation refers to physical phenomena in materials which are driven by the strong repulsive interactions between electrons. These phenomena include the origin of magnetism and a large class of insulators called Mott insulators. Recently there has been great interest in the study of a new phase of matter called the quantum spin liquid, where the tendency towards antiferromagnetic order is destroyed by quantum fluctuations. It is predicted theoretically that when this happens, novel excitations emerge which are not otherwise found in nature. Examples include fermionic particles carrying spin 1/2 but no charge and emergent gauge fields. Several candidate spin liquids have been discovered but their properties remain to be fully explored experimentally and theoretically. The project will carry out theoretical studies both to interpret existing data and to propose new experimental probes. Advances in the spin liquid problem have encouraged the P.I. to re-examine the long standing problem of high temperature superconductivity, which arises by adding carriers to a Mott insulator. The current project involves exploration of new ideas based on recent progress in the understanding of quantum spin liquids.

非技术摘要这一奖项支持凝结物理学的理论研究和教育。理论工作从新材料中的实验发现中汲取灵感，并旨在解释和预测新现象。这种新型现象通常在电子彼此强烈相互作用的材料中出现，这项工作将集中在这个丰富的舞台上。过去的例子包括诺贝尔获奖发现，例如分数量子厅效应和高温超导性。当前的项目涉及对一种称为量子自旋液体的新物质状态以及高温超导性背后的理论。该研究领域特别适合培训研究生和博士后研究员，因为数学成熟和对真实材料的理解都需要取得进展。技术摘要这一奖项支持凝结物理学的理论研究和教育。强相关性是指由电子之间强烈排斥相互作用驱动的材料中的物理现象。这些现象包括磁性的起源和一大类称为Mott绝缘子的绝缘体。最近，人们对一种称为量子自旋液体的新阶段的研究引起了极大的兴趣，在该物质中，抗铁磁序的趋势被量子波动破坏了。从理论上讲，当这种情况发生时，出现了新颖的激发，而这些激发在自然界中并未发现。例子包括携带自旋1/2但没有电荷和紧急量规场的费米子颗粒。已经发现了几种候选旋转液体，但它们的特性仍有旨在在实验和理论上进行充分探索。该项目将进行理论研究以解释现有数据并提出新的实验探针。旋转液体问题的进展鼓励了P.I.为了重新检查高温超导性的长期存在的问题，这是通过将载体添加到Mott绝缘体中而产生的。当前的项目涉及基于对量子旋转液体的了解的最新进展来探索新思想。