CAREER: Time-Resolved Studies of Correlated Electronic Materials

宾夕法尼亚大学的教师早期职业发展（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秒）激光脉冲将调节巨磁阻氧化物和弱铁磁二价六硼化物中的载流子浓度，从而扰乱它们的复杂多体态。各种时间分辨光学技术将被用来获得随后的磁、电荷和晶格动力学的多维视图。如果成功，所获得的见解可能有助于指导在涉及磁电阻和铁磁顺序的光学控制的技术应用中使用的相关材料的发现。这个项目的教育部分将原型化和部署迷人和有趣的基于互联网的实验，向高中生介绍科学发现的过程。到达一个网站的学生将有机会远程控制设备并进行实验。对实验设计的考虑将给予相当的重视，包括教育价值、可扩展性、与课程内容的整合以及目标年龄组。最近发现了新的和不为人知的磁铁，宾夕法尼亚大学的教师早期职业发展（Career）项目旨在利用短激光脉冲阐明它们的行为。这些磁铁的不同寻常的特性创造了一种可能性，通过适当的材料设计，光可以用来控制它们的磁性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。该项目旨在通过捕获各种材料对短暂激光激发的响应，为这种努力提供知识基础。这个项目的教育部分将原型化和部署迷人和有趣的基于互联网的实验，向高中生介绍科学发现的过程。到达一个网站的学生将有机会远程控制设备并进行实验。对实验设计的考虑将给予相当的重视，包括教育价值、可扩展性、与课程内容的整合以及目标年龄组。＊＊＊

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. ***