CAREER: Time-Resolved Studies of Correlated Electronic Materials

职业：相关电子材料的时间分辨研究

• 批准号: 0094156
• 负责人: James Kikkawa
• 金额: $ 45万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-02-01 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0094156&HistoricalAwards=false
• 关键词: CAREER; Time; Resolved; Studies; Correlated

This Faculty Early Career Development (CAREER) project at the University of Pennsylvania will study magnetic instabilities related to the carrier density in strongly interacting (correlated) electronic systems using state-of-the art ultrafast optical experiments. Short (100 fs) laser pulses will modulate the carrier concentration in colossally magnetoresistive oxides and weakly ferromagnetic divalent hexaborides, thereby perturbing their complex many-body states. A variety of time-resolved optical techniques will be utilized to obtain a multi-dimensional view of the ensuing magnetic, charge and lattice dynamics. If successful, the insight obtained may help guide the discovery of related materials of use in technological applications involving magnetoresistance and the optical control of ferromagnetic order. The educational component of this project will prototype and deploy captivating and entertaining internet-based experiments that introduce high school students to the process of scientific discovery. Students arriving at a web site will be given the opportunity to remotely grab the controls of an apparatus and to experiment with them. Considerable attention will be paid to experimental design considerations, including educational value, scalability, integration with course content, and target age groups. %%%New and poorly understood magnets have been discovered recently, and this Faculty Early Career Development (CAREER) project at the University of Pennsylvania aims to clarify their behavior using short laser pulses. The unusual properties of these magnets create the possibility that, with proper materials design, light could be used to control their magnetic strength and the positions of their north and south magnetic poles. Another potential use is in magnetic recording, where related materials could serve as sensors in computer hard disk drives. This project aims to provide a foundation of knowledge for such efforts by capturing a variety of material responses to brief laser excitation. The educational component of this project will prototype and deploy captivating and entertaining internet-based experiments that introduce high school students to the process of scientific discovery. Students arriving at a web site will be given the opportunity to remotely grab the controls of an apparatus and to experiment with them. Considerable attention will be paid to experimental design considerations, including educational value, scalability, integration with course content, and target age groups. ***

宾夕法尼亚大学的这个教师早期职业发展（CAREER）项目将使用最先进的超快光学实验研究与强相互作用（相关）电子系统中载流子密度相关的磁不稳定性。 短（100 fs）的激光脉冲将调制的载流子浓度的磁致磁阻氧化物和弱铁磁性的二价六硼化物，从而扰乱其复杂的多体状态。 将利用各种时间分辨光学技术来获得随后的磁性、电荷和晶格动力学的多维视图。 如果成功的话，所获得的洞察力可能有助于指导在涉及磁阻和铁磁有序的光学控制的技术应用中使用的相关材料的发现。该项目的教育部分将原型和部署迷人的和娱乐性的基于互联网的实验，介绍高中学生的科学发现的过程。学生到达一个网站将有机会远程抓住一个设备的控制和实验。相当多的注意力将支付给实验设计的考虑，包括教育价值，可扩展性，与课程内容的整合，和目标年龄组。 最近发现了新的和知之甚少的磁铁，宾夕法尼亚大学的这个教师早期职业发展（CAREER）项目旨在使用短激光脉冲来阐明它们的行为。 这些磁体的不寻常特性创造了一种可能性，即通过适当的材料设计，光可以用来控制它们的磁场强度和它们的南北磁极的位置。 另一个潜在的用途是磁记录，相关材料可以作为计算机硬盘驱动器的传感器。 该项目旨在通过捕捉各种材料对短暂激光激发的反应，为此类工作提供知识基础。该项目的教育部分将原型和部署迷人的和娱乐性的基于互联网的实验，介绍高中学生的科学发现的过程。学生到达一个网站将有机会远程抓住一个设备的控制和实验。相当多的注意力将支付给实验设计的考虑，包括教育价值，可扩展性，与课程内容的整合，和目标年龄组。 ***