Experiments on Time-Resolved Transport and Imaging of Moving Vortex Matter

运动涡旋物质的时间分辨输运与成像实验

• 批准号: 0456473
• 负责人: Eva Andrei
• 金额: --
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0456473&HistoricalAwards=false
• 关键词: Experiments; Time; Resolved; Transport; Imaging

This individual investigator award will support time-resolved transport and imaging studies in superconductors in order to elucidate the mechanisms that govern their response to applied fields and currents. The emphasis will be on the onset of motion in vortex lattices in type II superconductors, the vortex lattice's evolution and reorganization from a static structure into a moving steady state and how these properties depend on driving force, quenched disorder, temperature and boundaries. In addition experiments are proposed to identify characteristic signatures predicted for the moving phases including the transverse critical current, and the generation of a narrow band noise. The measurements will be carried out with a novel microscope, constructed in the PI's laboratory, which incorporates time-resolved transport, STM and Hall probe capabilities. The impact of this research is expected to extend to the physics of other moving structures including charge density wave systems, magnetic bubbles, and Wigner crystals. Work on this project will be carried out with the active participation of students at the graduate and undergraduate level and of post doctoral fellows. These young scientists will receive training in cutting edge research and in the use of state of the art equipment that will prepare them for filling demanding technical and research positions in industry and academia. %%%%Vortices in superconductors are tiny whirlpools of current swirling around microscopic threads containing a quantum of magnetic flux. It is because of vortices that superconductors are able to preserve their remarkable properties when carrying large amounts of current and it is thanks to vortices that superconductors hold the promise of revolutionizing many aspects of our daily lives including transportation, communications, medical diagnosis, energy storage and transmission lines. As long as vortices are pinned in place superconductivity is maintained, but once they start moving the superconductor transforms into a rather poor metal. The primary object of this research is to elucidate the mechanisms that lead to the onset of vortex motion and to study the patterns and dynamic phases that emerge once the motion is established. This research project will employ a variety of novel techniques developed in the PI's laboratory to probe the onset of motion of vortices in superconductors, their evolution and reorganization from a static structure into a moving state. The impact of this research is expected to extend to the physics of other moving structures including charge density wave systems, magnetic bubbles, and electron crystals. Work on this project will be carried out with the active participation of students at the graduate and undergraduate level and of post doctoral fellows. These young scientists will receive training in cutting edge research and in the use of state of the art equipment that will prepare them for filling demanding technical and research positions in industry and academia.

这项个人研究奖将支持超导体的时间分辨传输和成像研究，以阐明其对外加场和电流的响应机制。重点将是在II型超导体的涡旋晶格的运动，涡旋晶格的演变和重组从静态结构到移动的稳定状态，以及这些属性如何依赖于驱动力，淬火无序，温度和边界的发病。此外，实验提出了识别特征签名预测的移动阶段，包括横向临界电流，和窄带噪声的产生。测量将使用PI实验室建造的新型显微镜进行，该显微镜具有时间分辨传输、STM和霍尔探针功能。这项研究的影响预计将扩展到其他移动结构的物理学，包括电荷密度波系统，磁泡和维格纳晶体。该项目的工作将在研究生和本科生以及博士后研究员的积极参与下进行。这些年轻的科学家将接受尖端研究和使用最先进设备的培训，这将使他们为填补工业和学术界要求苛刻的技术和研究职位做好准备。超导体中的涡旋是微小的电流漩涡，围绕着包含磁通量量子的微观线旋转。正是由于涡流，超导体能够在携带大量电流时保持其显着的特性，并且由于涡流，超导体有望彻底改变我们日常生活的许多方面，包括交通，通信，医疗诊断，能量存储和传输线。只要涡旋被固定在适当的位置，超导性就能保持，但一旦它们开始移动，超导体就会变成一种相当差的金属。本研究的主要目的是阐明导致涡旋运动开始的机制，并研究一旦运动建立后出现的模式和动态阶段。该研究项目将采用PI实验室开发的各种新技术来探测超导体中涡旋运动的开始，它们从静态结构到运动状态的演变和重组。 这项研究的影响预计将扩展到其他移动结构的物理学，包括电荷密度波系统，磁泡和电子晶体。该项目的工作将在研究生和本科生以及博士后研究员的积极参与下进行。这些年轻的科学家将接受尖端研究和使用最先进设备的培训，这将使他们为填补工业和学术界要求苛刻的技术和研究职位做好准备。