Correlations, Disorder, and the Anderson-Mott Transition in the Bose Glass

Bose 玻璃中的相关性、无序性和安德森-莫特转变

• 批准号: 9705513
• 负责人: Kara Beauchamp
• 金额: $ 1.5万
• 依托单位: Wesleyan University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-05-01 至 1998-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705513&HistoricalAwards=false
• 关键词: Correlations; Disorder; Anderson; Mott; Transition

9705513 Beauchamp This is a Research Planning Grant for a new female faculty to study the Bose glass. The Bose glass is a system of superconducting vortices localized in a disordered columnar defect lattice, is described by the same Hamiltonian as the Coulomb glass, a system of localized charge carriers in a doped. The ground state of these systems, which determines whether they are conducting or insulating, depends in a complicated manner on the relative strengths of the particle- particle and particle-potential interactions. In the Bose glass, disorder can be controlled by creating the columnar defects in thin superconducting films using electron-beam lithography, and particle interactions can be controlled simply by changing the applied magnetic field. Using this model Bose glass system, this proposed research aims to elucidate the effects of independent variation of particle interactions and disorder on both the static configuration and the dynamic motion of the particles. Since such control over disorder and interaction is not possible in the Coulomb glass, the results of this research will provide valuable feedback for the theoretical understanding of these systems. Furthermore, the results of this research will deepen our understanding of vortex pinning in those high temperature superconductors that have disordered columnar defect lattices produced by heavy-ion bombardment. %%% Although physicists have been successful in developing a detailed understanding of electronic and magnetic properties of a wide range of materials, disorder and strong interparticle interactions in some materials has encumbered such a detailed understanding. The present research will focus on the role of disorder and interparticle interactions in a system of magnetic flux tubes, called vortices, in superconducting thin films with intentionally fabricated defects. The defects will be created and controlled using electron-beam lithography, and vortex interactions will be controlled simply by changing the applied magnetic field. The effects of disorder and interparticle interactions on the vortex configurations and vortex motion will be measured. Sincince such control over disorder and interactions is not possible in other disordered, interacting systems, the results of this research will provide valuable feedback for the theoretical understanding of these systems. Furthermore, the results of this research will deepen our understanding of vortex motion in high temperature superconductors. This a Research Planning Grant. ***

9705513比彻姆，这是一项研究计划助学金，面向一名新的女性教职员工，用于研究玻色玻璃。玻色玻璃是定域在无序柱状缺陷晶格中的超导涡旋系统，其哈密顿量与库仑玻璃相同，库仑玻璃是掺杂的局域载流子系统。这些系统的基态决定了它们是导电的还是绝缘的，它以一种复杂的方式取决于粒子-粒子和粒子-势相互作用的相对强度。在玻色玻璃中，可以通过电子束光刻在超导薄膜中产生柱状缺陷来控制无序，而通过改变外加磁场可以简单地控制粒子之间的相互作用。利用这个玻色玻璃系统模型，本研究旨在阐明粒子相互作用和无序的独立变化对粒子的静态构型和动态运动的影响。由于在库仑玻璃中不可能对无序和相互作用进行这样的控制，本研究的结果将为从理论上理解这些系统提供有价值的反馈。此外，这一研究结果将加深我们对重离子轰击产生无序柱状缺陷晶格的高温超导体中涡旋钉扎的理解。虽然物理学家已经成功地对各种材料的电子和磁性有了详细的了解，但某些材料中的无序和强烈的粒子间相互作用阻碍了对这种详细理解的理解。目前的研究将集中在具有故意制造缺陷的超导薄膜中的无序和粒子间相互作用在称为涡流的磁通量管系统中的作用。缺陷的产生和控制将使用电子束光刻，涡旋相互作用将简单地通过改变外加磁场来控制。无序和粒子间相互作用对涡旋构型和涡旋运动的影响将被测量。由于这种对无序和相互作用的控制在其他无序的相互作用系统中是不可能的，因此本研究的结果将为从理论上理解这些系统提供有价值的反馈。此外，这一研究结果将加深我们对高温超导体中涡旋运动的理解。这是一项研究计划拨款。***