Superconductivity, Correlations, and Nonequilibrium Phenomena in Novel Low Dimensional Systems

新型低维系统中的超导性、相关性和非平衡现象

• 批准号: 0204871
• 负责人: Philip Adams
• 金额: $ 31.51万
• 依托单位: Louisiana 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: 2002-06-01 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0204871&HistoricalAwards=false
• 关键词: Superconductivity; Correlations; Nonequilibrium; Phenomena; Novel

This individual investigator award will provide support for a program that focuses on the study of electron correlation effects in two-dimensional systems, such as ultra-thin magnetic-impurity-doped Be films, and ultra-thin superconducting Be and Al films. Some bulk materials with a strongly layered structure such as superconducting LaSb2 and metamagnetic SmSb2 will also be studied. One of the primary goals of the program is to investigate the transport and tunneling characteristics of these systems in high magnetic fields and low temperatures. Their behavior in such extreme environments gives insight into how low dimensionality, disorder, and correlations can give rise to exotic effects such state memory, reentrance, multifold magnetoresistance, non-equilibrium fluctuations, and quantum transitions. Besides being at the forefront of condensed matter research, the program will provide an important venue for the training undergraduates, graduate students, and K-12 science teachers. The latter will be made possible by sponsoring summer internships for "Teach For America" corps members. This individual investigator award provides support for a program that investigates how the repulsive interactions between electrons affects their ability to conduct electricity and more importantly how these interactions can orchestrate seemingly improbable behavior such as memory effects and extremely large increases in resistance with the application of magnetic field. Emphasis is placed on systems for which the electron motion is confined to a plane such as is the case for metal films that are only a few atoms thick. The behavior of these systems gives insight into how low dimensionality, disorder, and electronic correlations can give rise to novel and perhaps useful properties that may one day be of technological relevance. This type of search and discovery research is important for maintaining the health of the national research and development enterprise. The program also provides an important venue for the training undergraduates, graduate students, and K-12 science teachers. The latter is made possible by being a summer internship sponsor for "Teach For America" corps members.

这一个人研究人员奖将为一个专注于研究二维系统中电子关联效应的项目提供支持，这些系统包括超薄的磁性杂质掺杂的Be薄膜、超薄的超导Be和Al薄膜。一些具有强层状结构的块体材料，如超导LaSb2和超磁性SmSb2也将被研究。该计划的主要目标之一是研究这些系统在强磁场和低温下的输运和隧道特性。他们在这种极端环境中的行为让我们深入了解低维、无序和相关性如何产生奇异效应，如状态记忆、重入、多重磁阻、非平衡涨落和量子跃迁。除了处于凝聚态研究的前沿，该项目还将为本科生、研究生和K-12科学教师的培训提供重要场所。后者将通过赞助“为美国而教”剧团成员的暑期实习而成为可能。这一个人研究人员奖为一个项目提供了支持，该项目研究电子之间的排斥相互作用如何影响它们的导电能力，更重要的是，这些相互作用如何协调看似不太可能的行为，如记忆效应和施加磁场时电阻的极大增加。重点放在电子运动被限制在平面上的系统上，例如只有几个原子厚度的金属薄膜的情况。这些系统的行为让我们洞察到低维、无序和电子关联如何能够产生新的、或许有用的特性，这些特性有朝一日可能具有技术相关性。这种类型的搜索和发现研究对于维护国家研发企业的健康发展具有重要意义。该项目还为本科生、研究生和K-12科学教师的培训提供了重要场所。后者是通过成为“为美国而教”团队成员的暑期实习赞助商而实现的。