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Fermi Surface Topology and the Superconducting Proximity Effect

费米表面拓扑和超导邻近效应

基本信息

批准号：
1709987
负责人：
Kenneth Burch
金额：
$ 45.42万
依托单位：
Boston College
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-08-15 至 2020-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1709987&HistoricalAwards=false
关键词：
Fermi Surface Topology Superconducting Proximity

项目摘要

Non-Technical Abstract:Unconventional superconductivity and the conditions under which associated physical phenomena may be observed have remained one of the most active areas of condensed matter physics. This search, began nearly 60 years ago with Meissner's original discovery of the proximity effect (induction of superconductivity into a normal material via direct contact). Interest in the proximity effect was reinvigorated by predictions of new phases and their associated particles (non-abelian anyons) that can be used for next generation topological quantum computing. The PI was the first to demonstrate a proximity effect between a high Tc, unconventional superconductor (cuprates) and a semiconductor. Building on recent success with a range of superconductors, the PI pursues the emergence of new superconducting states. Specific focus is on the role of the electronic configuration of both materials in generating proximity effects and developing new methods to probe the interface and emergent particles. Emphasis is given to diversification of the STEM workforce, including informing K-12 about 2D materials and topology via the Lynch School of Education's "Science Educators for Urban Schools" program; creating hands-on demonstrations for BC's Making Science a Fan-Tastic Experience, increasing participation of women, first generation and underrepresented minorities by partnering with BC's McNair, National Research Mentoring Network and Women in Science and Technology programs.Technical Abstract:The proposal aims to understand the role of the Fermi surface of the normal and superconducting materials in the proximity effect. It is based on the success of the PI's mechanical bonding technique in generating a proximity effect between various superconductors and Dirac materials. The PI pursues the emergence of new unconventional/topological superconducting states. Coordinated fabrication and spectroscopic efforts provide answers to several questions in the field of proximity induced topological superconductivity: What is the role of the superconductor's Fermi surface? Does proximity induced superconductivity emerge in Weyl semimetals? Is the resulting superconductivity unconventional? Can we detect and manipulate the bound states that emerge at edges? Bound states and the proximity effect are explored as the superconductor's Fermi surface is tuned in FeTe1-xSex. Next the proximity effect are searched for in the WSM, MoTe2. The last stages employs spectroscopic probes to uncover the unconventional/topological nature of the superconductivity, along with the resulting excitations.

非常规超导电性和观察到相关物理现象的条件一直是凝聚态物理学最活跃的领域之一。这项研究始于近60年前迈斯纳最初发现的邻近效应(通过直接接触将超导电性感应到正常物质中)。对新相及其相关粒子(非阿贝尔任意子)可用于下一代拓扑量子计算的预测，重新激发了人们对邻近效应的兴趣。等电点是第一个显示高T_c、非常规超导体(铜酸盐)和半导体之间的邻近效应。在最近一系列超导体成功的基础上，PI追求新的超导态的出现。具体的重点是这两种材料的电子组态在产生邻近效应和开发新的方法来探测界面和出射粒子方面的作用。重点是STEM劳动力的多样化，包括通过林奇教育学院的“城市学校科学教育者”计划向K-12提供有关2D材料和拓扑的信息；通过与BC的McNair、国家研究指导网络和妇女参与科学和技术计划合作，为BC的“让科学成为粉丝体验”创建动手演示，增加妇女、第一代和代表不足的少数群体的参与。它基于PI的机械结合技术在各种超导体和狄拉克材料之间产生邻近效应的成功。PI追求新的非常规/拓扑超导态的出现。协调的制造和光谱工作为邻近诱导的拓扑超导领域的几个问题提供了答案：超导体的费米面起什么作用？在Weyl半金属中是否出现了近邻诱导超导电性？由此产生的超导电性是不是非常规的？我们能探测和操控出现在边缘的束束态吗？在FeTe1-xSex中研究了超导体的费米面调谐时的束缚态和邻近效应。接下来，在WSM MoTe2中搜索邻近效应。最后一个阶段使用光谱探测器来揭示超导电性的非常规/拓扑性质，以及由此产生的激发。