Exploring unconventional pairing symmetry in topological materials and novel doped two-dimensional superconductors

探索拓扑材料和新型掺杂二维超导体中的非常规配对对称性

• 批准号: 1411067
• 负责人: Nadya Mason
• 金额: $ 75万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1411067&HistoricalAwards=false
• 关键词: Exploring; unconventional; pairing; symmetry; topological

NON-TECHNICALThis award from the Condensed Matter Physics program of the Division of Materials Research supports the University of Indiana at Urbana Champaign with a project to determine the fundamental mechanisms behind exotic superconductors. These are materials that exhibit zero electrical resistance, but whose properties are poorly understood. This work will resolve current controversies regarding the properties of exotic superconductors and reveal new physics, thereby laying the groundwork for utilizing exotic superconductors in applications. The collaborative structure of the research will provide a rich environment for training undergraduates and graduate students in a broad spectrum of nanotechnology-related work. Educational aspects will be further integrated through the development of courses directly related to the proposed research and through research-related seminars and workshops that target women and underrepresented minorities.TECHNICALThe goal of this project is to determine the symmetry and transport properties of superconducting materials suspected of exhibiting unconventional pairing symmetry. The aim is to both gain key insight into complex superconducting systems and also to lay the groundwork for utilizing novel excitation modes in devices. The focus will be on new classes of materials whose superconductivity is likely to be unconventional, but whose pairing symmetry has not been verified and whose transport is poorly understood: specifically, proximity-coupled topological insulators (possibly complex p-wave), topological superconductors (possibly complex p-wave), and doped dichalcogenides (unknown symmetry). A suite of complementary experimental techniques will be used to optimally probe superconductivity, including: phase-sensitive Josephson interferometery, tunneling spectroscopy, low-temperature transport, nano-patterned proximity-coupling, and strong chemical or ionic doping. This work will resolve controversies regarding the order parameter symmetry of exotic superconductors and reveal new physics, such as the existence of Majorana modes in superconducting topological systems or the nature of the dome-shaped superconducting phase diagram in doped MoS2. The collaborative structure of the research will provide a rich environment for training undergraduates and graduate students in a broad spectrum of nanotechnology-related work. Educational aspects will be further integrated through the development of courses directly related to the proposed research and through research-related seminars and workshops that target women and underrepresented minorities.

非技术性该奖项来自材料研究部凝聚态物理项目，支持印第安纳大学香槟分校的一个项目，以确定奇异超导体背后的基本机制。这些材料的电阻为零，但人们对其特性知之甚少。这项工作将解决当前关于奇异超导体特性的争议，并揭示新的物理现象，从而为在应用中利用奇异超导体奠定基础。该研究的合作结构将为培训本科生和研究生进行广泛的纳米技术相关工作提供丰富的环境。教育方面将通过开发与拟议研究直接相关的课程以及针对女性和代表性不足的少数群体的与研究相关的研讨会和讲习班来进一步整合。技术该项目的目标是确定怀疑表现出非常规配对对称性的超导材料的对称性和输运特性。目的是获得对复杂超导系统的关键见解，并为在设备中利用新颖的激励模式奠定基础。重点将放在新型材料上，这些材料的超导性可能是非常规的，但其配对对称性尚未得到验证，其输运知之甚少：具体来说，邻近耦合拓扑绝缘体（可能是复杂的 p 波）、拓扑超导体（可能是复杂的 p 波）和掺杂二硫属化物（对称性未知）。一套互补的实验技术将用于最佳地探测超导性，包括：相敏约瑟夫森干涉仪、隧道光谱、低温传输、纳米图案邻近耦合以及强化学或离子掺杂。这项工作将解决有关奇异超导体有序参数对称性的争议，并揭示新的物理学，例如超导拓扑系统中马约拉纳模式的存在或掺杂MoS2中圆顶形超导相图的性质。该研究的合作结构将为培训本科生和研究生进行广泛的纳米技术相关工作提供丰富的环境。将通过开发与拟议研究直接相关的课程以及针对妇女和代表性不足的少数群体的与研究相关的研讨会和讲习班，进一步整合教育方面的内容。