Interplay of Superconductivity and Localization

超导性和局域化的相互作用

基本信息

批准号：
277365008
负责人：
Privatdozent Dr. Igor Gornyi
金额：
--
依托单位：
Institut für Nanotechnologie (INT)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/277365008?language=en
关键词：
Interplay Superconductivity Localization

项目摘要

A central research area in condensed matter physics is theoretical prediction, classification, and description as well as experimental investigation of different phases of matter. The project is devoted to the theoretical study of phase transitions between superconducting, metallic, and insulating states in two-dimensional disordered interacting systems. The fundamental theoretical problem addressed in the proposal is that of the interplay of superconductivity, disorder, and electronic correlations. The major direction of the project is related to low-dimensional disordered superconducting structures. One of the central questions within this direction is the nature of the Superconductor-Insulator Transition in disordered systems, its degree of universality, and character of transport in its vicinity. The Superconductor-Insulator Transition (SIT) belongs to a broad class of disorder-induced quantum phase transitions which includes Anderson metal-insulator transition and quantum Hall transition. Localization-delocalization quantum phase transitions form an actively developing field of condensed matter physics. Electron-electron interaction effects at the transitions represent one of central research directions. Critical properties in the corresponding quantum critical regimes are governed by interplay of disorder- and interaction-controlled quantum-coherent effects. The project is intended to develop a coherent picture of disordered superconductors involving all the key ingredients: superconducting correlation, disorder-induced multifractality, and electron-electron interactions in various channels. The emphasis will be put on superconducting properties of thin films demonstrating the supeconductor -insulator transition and novel materials for high temperature superconductivity. The main expected result is the phase diagram describing different states of strongly correlated low-dimensional systems. The objectives of the project are expected to be particularly relevant for searching high-temperature superconductivity in novel materials. Methodologically, it is planned to generalize the interacting sigma-model with the interaction in the Cooper channel to include additional correlation mechanisms and unconventional symmetries.The Work Plan consists of the three inter-related Tasks:1. To develop a comprehensive theory of the SIT in thin films.2. To investigate the finite-T superconducting transition in disordered films, going beyond the mean-field description.3. To identify possibilities of disorder-induced enhancement of superconductivity in novel materials and nanosystems.

凝结物理学中的中央研究领域是理论预测，分类和描述以及对物质不同阶段的实验研究。该项目致力于在二维无序相互作用系统中超导，金属和绝缘状态之间的相变的理论研究。该提案中解决的基本理论问题是超导性，混乱和电子相关性的相互作用。该项目的主要方向与低维无序的超导结构有关。在这个方向上的核心问题之一是无序系统中超导体 - 绝缘体转变的性质，其普遍性程度和附近运输特征。超导体 - 绝缘体过渡（SIT）属于一类繁殖诱导的量子相变，其中包括安德森金属 - 绝缘体过渡和量子霍尔的跃迁。定位 - 偏置量子相变形成了一个积极发展的凝结物理学领域。过渡时的电子电子相互作用效应代表了中央研究方向之一。相应的量子临界方案中的临界特性受障碍和相互作用控制的量子辅助效应的相互作用的控制。该项目旨在开发涉及所有关键成分的无序超导体的连贯图片：超导相关性，疾病诱导的多重纹理和各种通道中的电子 - 电子相互作用。重点将放在薄膜的超导特性上，这些薄膜展示了supecductor -unductor -unductor transition和高温超导性的新型材料。主要的预期结果是相图描述了强相关的低维系统的不同状态。预计该项目的目标与在新材料中搜索高温超导性特别相关。从方法上讲，计划将相互作用的Sigma模型与Cooper通道中的相互作用概括为包括其他相关机制和非常规的对称性。工作计划由三个相互关联的任务组成：1。在薄膜中开发一个智能的综合理论。2。为了研究无序膜中有限的T超导过渡，超越了平均场描述3。确定新型材料和纳米系统中障碍引起的超导性增强的可能性。