Fermi Surface Topology and the Superconducting Proximity Effect

非常规超导及其相关物理现象的观测条件一直是凝聚态物理学中最活跃的领域之一。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性诱导到普通材料中）。对新相及其相关粒子（非阿贝尔任意子）的预测重新激发了人们对邻近效应的兴趣，这些粒子可用于下一代拓扑量子计算。PI首次证明了高Tc非常规超导体（铜酸盐）和半导体之间的接近效应。在最近一系列超导体成功的基础上，PI追求新的超导状态的出现。具体的重点是两种材料的电子结构在产生接近效应和开发新的方法来探测界面和紧急粒子中的作用。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传授二维材料和拓扑结构；为不列颠哥伦比亚省的“让科学成为一种奇妙的体验”项目创建动手演示，通过与不列颠哥伦比亚省的麦克奈尔项目、国家研究指导网络和妇女参与科技项目合作，增加妇女、第一代和未被充分代表的少数民族的参与。技术摘要：本提案旨在了解正常材料和超导材料的费米面在邻近效应中的作用。它是基于PI的机械键合技术在各种超导体和狄拉克材料之间产生接近效应的成功。PI追求新的非常规/拓扑超导态的出现。协同制造和光谱工作为邻近诱导拓扑超导领域的几个问题提供了答案：超导体费米表面的作用是什么？在Weyl半金属中是否会出现邻近诱导的超导性？由此产生的超导性是非常规的吗？我们能检测和操纵边缘处出现的束缚态吗？研究了超导体费米表面在FeTe1-xSex中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。最后阶段使用光谱探针来揭示超导性的非常规/拓扑性质，以及由此产生的激发。

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.