CAREER: Mesoscopic Physics of Disordered Superconductors: An Arena for Research and Education

9702661刘：这是一个实验性的职业资助项目，主要研究无序对中尺度超导体的影响。一个中心的研究目标是通过实验确定是否存在负的局部超流体密度。这些实验将利用电子束光刻和超薄膜制造技术，以及配备齐全的低温测量实验室。一些特别的目标是测量单个和阵列介观超导铋环中的磁阻和电场效应；测量Auln合金和铋样品中的介观磁场波动。这些实验的完成将对负超流体密度的问题有很大的影响。这项拟议的研究将被整合到一项教育计划中，以帮助提高学生的学习能力，并培养未来的科学家。该教育计划的设计部分是为了促进妇女参与科学，这将有利于科学及其作为一种职业的福祉。这项工作所获得的基础知识将加深我们对无序超导体中库珀配对关联的基本性质的理解，并可能对几个相关领域产生重大影响。介观尺度超导体的行为在电磁辐射敏感传感器和高性能低耗散逻辑电路等潜在应用中也具有重要意义。这个实验职业奖助金项目探索了当样品变得很小或很薄，以及超导材料本身变得无序时超导现象的根本变化。由于超导本质上的量子力学性质，正在研究的问题变得更加重要和有趣。这项工作的一个重点是寻找一种特殊的理论上可能的效应，称为负超流体密度。这种效应的存在，如果被提出的工作所证实，将对科学的相关领域产生影响。这种研究的长期成果可能包括开发用于探测电磁辐射和(或)进行快速计算的改进的电子设备。该项目包括的教育计划将研究和教育融为一体，旨在促进妇女参与科学。***

9702661 Liu This experimental CAREER grant project focuses on the effects of disorder on meso-scale superconductors. A central research goal is to determine experimentally whether a negative local superfluid density exists. The experiments will make use of e-beam lithography and ultrathin film fabrication techniques and a well equipped low temperature measurement laboratory. Some specific aims are measurement of magnetoresistance and electric field effect in single and arrays of mesoscopic superconducting bismuth rings; measurement of mesoscopic fluctuations in magnetic fields in Auln alloy and Bi samples. The completion of these experiments will have a strong bearing on the question of the negative superfluid density. The proposed research will be integrated into an education plan to help enhance student learning and to train future scientists. The education plan is designed in part to promote women's participation in science, which will be beneficial for science and its well being as a profession. the fundamental knowledge which will be gained in this work will deepen our understanding of the fundamental nature of Cooper pairing correlation in disordered superconductors and may have significant impacts on several related fields. The behavior of mesoscopic scale superconductors is also relevant in potential applications including sensitive sensors of electromagnetic radiation and high performance low dissipation logic circuits. %%% This experimental CAREER grant project probes the fundamental changes in the phenomenon of superconductivity as the samples become very small or very thin, and as the superconducting material itself becomes disordered. The questions being studied are made more important and interesting by the essentially quantum mechanical nature of superconductivity. A focus of the work is to search for a particular theoretically possible eff ect, called a negative superfluid density. The existence of such as effect, if proven by work such as is proposed, would have implications for related areas of science. The long term outcome of such research could include the development of improved electronic devices for detecting electromagnetic radiation and/or for making rapid calculations. The education plan included in this project integrates research and education and aims to promote women's participation in science. ***