高温超导体的超导机理和奇异正常态的角分辨光电子能谱研究

项目名称： 高温超导体的超导机理和奇异正常态的角分辨光电子能谱研究

项目编号： No.11334010

项目类型： 重点项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 周兴江

作者单位： 中国科学院物理研究所

项目金额： 320万元

中文摘要： 我们提议采用自主研制的真空紫外激光角分辨光电子能谱系统,对高温超导体的超导机理和奇异正常态性质开展系统和深入的研究。主要聚焦在三个重要方面, 1).电子结构随掺杂的演变规律,着重研究费米口袋以及量子临界点问题；2).赝能隙的本质以及超导能隙与赝能隙的关系；3).超导电子配对的机理。 我们研制的尖端光电子能谱系统性能国际领先，具有超高分辨率和超高精度的独特优势。 在基金委前期的资助下，我们已取得了重要进展，在设备、人才和经验积累等方面打下了坚实的基础，逐渐凝聚了自己的研究方向和特色。我们已经建立了和国际国内顶尖研究组在高质量样品和理论方面的合作。我们选择的课题既是高温超导研究中的核心问题，也是极具有挑战性的攻坚课题。通过本研究计划，我们将充分利用我们拥有的得天独厚的有利条件，针对这几方面关键性的问题开展研究，为理解高温超导机理和正常态的奇异性质提供具有决定性意义的信息，力争取得突破。

中文关键词： 高温超导体;角分辨光电子能谱;电子结构;高温超导机理;正常态

英文摘要： We propose to systematically investigate the superconductivity mechanism and anomalous normal state properties of high temperature superconductors using our self-developed VUV-laser-based angle-resolved photoemission (ARPES) system. We will focus on three aspects: (1). Evolution of electronic structure with doping, particularly the nature of Fermi pocket and quantum critical points; (2). Origin of pseudogap and its relationship with the superconducting gap; (3). The superconducting electron pairing mechanism. Our advanced ARPES systems are state-of-the-art, possessing unique performance such as super-high instruemntal resolution and superior precision. Under the previous support of NSFC, we have made big progress in the study, laying a solid foundation in instrumentation, people and experience accumulation. Particularly we have formed our own research directions and unique features. we have built good collaboration with top groups, domestic and abroad in growing high quality samples and in theory and computation. The topics we have chosen represent key issues in superconductivity research; they also present daunting and mountain-climbing chanllenges. We believe, through the present research plan, using the exceptional advantages we have to carry out investigations on these critical issues, we will provide decisive information in understanbding the superconductivity mechanism and anomalous normal state properties of high temperature superconductors. We will strive to achieve breakthroughs.

英文关键词： High Temperature Superconducto;Angle-resolved photoemission;Electronic structure;Mechanism of superconductivity;Normal state