Quantum Aspects of Condensed Matter

凝聚态物质的量子方面

• 批准号: 9531575
• 负责人: Sudip Chakravarty
• 金额: $ 24万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-03-01 至 1999-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9531575&HistoricalAwards=false
• 关键词: Quantum; Aspects; Condensed; Matter

9531575 Chakravarty This grant is a renewal of an ongoing program led by a mid- career condensed matter theorist. The topics of interest in this grant are Quantum Magnetism and non-Fermi liquid ground sates. In quantum magnetism, the PI proposes to calculate the dynamic structure factor of a 2-dimensional quantum antiferromagnet. The calculation will help understand the neutron scattering measurements and provide insight into a special class of fermionic excitations (spinons) at short wavelengths and high energies. Also planned is a study of the materials which exhibit "colossal" magnetoresistance. The research on non-Fermi liquids, using concept of scaling and effective fields, will involve phenomenology and possible classification. %%% In a world where materials are either metallic or nonmetallic, current research is converging on a class of materials that show metallic character in resistivity but all of their other properties (specific heat, magnetic susceptibility) are quite anomalous. This grant will develop a phenomenological theory of such non-Fermi liquids. The grant also includes work on quantum antiferromagnets in 2-dimension. As a theoretical problem this addresses some outstanding questions since the PI's earlier seminal contributions. ***

9531575查克拉瓦蒂这项资助是一个正在进行的项目的更新，该项目由一位职业生涯中期的凝聚态理论家领导。 在这个补助金感兴趣的主题是量子磁学和非费米液体基态。 在量子磁学中，PI提出计算二维量子反铁磁体的动态结构因子。 计算将有助于理解中子散射测量，并提供洞察一类特殊的费米激发（自旋）在短波长和高能量。 还计划对表现出“巨大”磁阻的材料进行研究。 利用标度和有效场的概念对非费米液体进行研究，将涉及唯象学和可能的分类。 在一个材料要么是金属要么是非金属的世界里，目前的研究集中在一类材料上，这些材料在电阻率上显示出金属特征，但它们的所有其他性质（比热，磁化率）都非常异常。 这项资助将发展这种非费米液体的唯象理论。 该基金还包括二维量子反铁磁体的研究。 作为一个理论问题，这解决了一些悬而未决的问题，因为PI的早期开创性的贡献。 ***