Physics of Strongly-Interacting, Many-Electron Systems

强相互作用多电子系统物理学

• 批准号: 9817242
• 负责人: Douglas Scalapino
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-15 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9817242&HistoricalAwards=false
• 关键词: Physics; Strongly; Interacting; Many; Electron

9817242ScalapinoThis project is for work aimed at calculating and understanding the physical properties of strongly-interacting many-electron systems. It includes both numerical and phenomenological analytic calculations for basic lattice Hamiltonians such as the Heisenberg, Hubbard, and t-J models. These models exhibit a wide range of phases including antiferromagnetism, charge density waves, superconductivity, domain wall formation, and phase separation that are descriptive of similar behavior in many materials with technologically important magnetic and superconducting properties. The goal of this work is to understand the basic mechanisms and competition that lead to this rich array of phases and to develop reliable ways of calculating their properties.%%%Many novel materials with magnetic and superconducting properties of potential technological and commercial importance, such as high-temperature superconductors, cannot be adequately described by theoretical models for the electronic structure that assume a mean-field behavior for the interactions between electrons. Such systems require the use of models which incorporate explicit correlation effects between electrons. This research aims to improve our understanding of the electronic properties of materials where many-electron effects dominate the interesting electronic properties, and will be critical in advancing the development and use of such technologically important materials.***

这个项目旨在计算和理解强相互作用的多电子系统的物理性质。它包括数值和现象学分析计算的基本晶格哈密顿，如海森堡，哈伯德，和t-J模型。这些模型展示了广泛的相，包括反铁磁性，电荷密度波，超导性，畴壁形成和相分离，这些描述了许多具有技术上重要的磁性和超导特性的材料的类似行为。这项工作的目标是了解导致这种丰富相阵列的基本机制和竞争，并开发计算其性质的可靠方法。许多具有潜在技术和商业重要性的磁性和超导特性的新材料，如高温超导体，不能用假设电子之间相互作用的平均场行为的电子结构的理论模型来充分描述。这样的系统需要使用包含电子之间显式相关效应的模型。本研究旨在提高我们对多电子效应主导有趣电子特性的材料的电子特性的理解，并将对推进此类技术重要材料的开发和使用至关重要