Role of Disorder in Strongly Correlated Low-Dimensional Systems

无序在强相关低维系统中的作用

• 批准号: 0225698
• 负责人: Kun Yang
• 金额: --
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-12-01 至 2007-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0225698&HistoricalAwards=false
• 关键词: Role; Disorder; Strongly; Correlated; Low

This award supports research and education that aims to elucidate the interplay between electron-electron interaction and disorder in low dimensional electronic systems. This remains a major and difficult problem in modern condensed matter physics. This award supports studies of: edge states of fractional quantum Hall liquids, especially in the presence of edge reconstruction; bulk fractional quantum Hall liquids in the presence of disorder, focusing on the effects of disorder and interaction on their transport properties and critical behavior near the quantum phase transitions between different quantum Hall phases; quasiparticle transport properties in two-dimensional non-s-wave superconductors in the absence of time-reversal symmetry, with the cuprates as the prototype; and magnetic and superconducting properties of quantum dots and nano-size metallic grains. The PI will combine numerical and analytical methods in these investigations. Specific methods include mapping to an effective field theory, exact diagonalization, and quantum Monte Carlo simulation. Numerical studies will elucidate the topological properties, such as Chern numbers, of many-electron wave functions and quasiparticle wave functions in the PI's investigations of bulk fractional quantum Hall liquids and quasiparticle transport properties in superconductors. Calculations will focus on physical quantities that can be directly measured experimentally, and compare our results with experiments whenever possible. The broader impacts of this award are primarily educational; the work involves training the next generation of condensed matter theorists.This award supports fundamental research and education that seeks to advance our understanding of strongly interacting electrons confined to one or two dimensions and disrupted by imperfections. The PI will study the combined effect of strong correlations and disorder in a variety of materials and systems including quantum Hall systems and nanoscale ferromagnets and superconducting grains. This basic research helps improve understanding of fundamental and novel electronic states and phenomena that occur in materials and contributes to the intellectual underpinnings of potential future electronic device technologies. This award also supports training the next generation of condensed matter theorists.

该奖项支持旨在阐明低维电子系统中电子-电子相互作用和无序之间相互作用的研究和教育。这仍然是现代凝聚态物理学中的一个重点和难点问题。该奖项支持以下研究：分数分数量子霍尔液体的边态，特别是在边缘重构的情况下；无序存在下的块状分数量子霍尔液体，重点研究无序和相互作用对其输运性质的影响以及不同量子霍尔相之间的量子相变附近的临界行为；以铜酸盐为原型，在不存在时间逆转对称性的情况下，二维非S波超导体中的准粒子输运性质；以及量子点和纳米金属颗粒的磁性和超导性质。PI将在这些研究中结合数值和分析方法。具体方法包括映射到有效场论、精确对角化和量子蒙特卡罗模拟。在PI对体分数量子霍尔液体和超导体中准粒子输运性质的研究中，数值研究将阐明多电子波函数和准粒子波函数的拓扑性质，如陈数。计算将集中在可以通过实验直接测量的物理量上，并尽可能将我们的结果与实验进行比较。这个奖项的更广泛的影响主要是教育的；这项工作涉及培训下一代凝聚态理论家。这个奖项支持基础研究和教育，试图促进我们对强相互作用电子的理解，这些电子被限制在一个或两个维度，并被缺陷扰乱。PI将研究各种材料和系统中强关联和无序的综合效应，包括量子霍尔系统和纳米级铁磁体和超导颗粒。这项基础研究有助于提高对材料中出现的基本和新颖的电子状态和现象的理解，并有助于为潜在的未来电子设备技术提供智力基础。该奖项还支持培养下一代凝聚态理论家。