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.

该单独的研究者奖将支持超导体中的时间分辨的运输和成像研究，以阐明控制其对应用领域和电流的反应的机制。重点将是II型超导体涡流晶格中运动的开始，涡流晶格的演变和从静态结构重组为移动的稳态，以及这些特性如何取决于驱动力，淬火障碍，温度和边界。另外，提出了实验以识别针对运动相预测的特征特征，包括横向临界电流和狭窄带噪声的产生。测量结果将使用新型显微镜进行，该显微镜在PI的实验室中构建，该显微镜结合了时间分辨的运输，STM和HALL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，磁性气泡和Wigner晶体。该项目的工作将与学生积极参与研究生和本科级别以及博士后研究员的工作。这些年轻的科学家将接受尖端研究的培训以及使用最先进的设备，以准备填补行业和学术界的技术和研究职位。超导体中的%%%%涡流是围绕包含量子磁通量的微观螺纹旋转的电流旋转的微小旋流。正是由于涡流，超导体在承载大量电流时能够保留其出色的特性，这要归功于涡流，超导体具有彻底改变我们日常生活的许多方面的希望，包括运输，通信，医疗诊断，能源存储和传输线。只要将涡流固定在地位上，就可以保持超导性，但是一旦它们开始移动，超导体就会变成相当差的金属。这项研究的主要目的是阐明导致涡旋运动发作的机制，并研究一旦建立运动的模式和动态阶段。该研究项目将采用PI实验室中开发的各种新技术，以探测超导体中涡流运动的开始，它们从静态结构到移动状态的演变和重组。 这项研究的影响有望扩展到其他移动结构的物理，包括电荷密度波系统，磁性气泡和电子晶体。该项目的工作将与学生积极参与研究生和本科级别以及博士后研究员的工作。这些年轻的科学家将接受尖端研究的培训以及使用最先进的设备，以准备填补行业和学术界的技术和研究职位。