CAREER: Tunable Connate Topological Superconductivity in 2D Transition Metal Dichalcogenides

职业：二维过渡金属二硫化物中的可调谐共生拓扑超导

• 批准号: 2338984
• 负责人: Daniel Rhodes
• 金额: $ 71.27万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-09-01 至 2029-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2338984&HistoricalAwards=false
• 关键词: CAREER; Tunable; Connate; Topological; Superconductivity

Non-Technical Abstract: Superconducting and quantum-based technologies are promising avenues for realizing faster and more efficient computation, energy-efficient transport of electricity, and novel methods that enhance the capabilities of materials metrology. One scheme for realizing robust reading of quantum states for such technologies is to combine superconductivity with electronic states that only exist at the edges of materials, resulting in a special state that merges these two properties: connate topological superconductivity. Few-layer transition metal dichalcogenides are a promising subclass of materials that have been predicted to exhibit connate topological superconductivity and are highly tunable with moderate changes to the electrostatic environment. In this project, the research team aims to discover, develop, and electrostatically control connate topological superconducting behavior in semimetallic and superconducting transition metal dichalcogenides. The success of this project will introduce new methods with which to probe novel forms of superconductivity and lead to greater insight into the general mechanisms that govern superconductivity. In addition, this project integrates graduate and undergraduate students into the research effort and develops and runs outreach activities for K-12 students in collaboration with teachers from local school districts. Technical Abstract: A two-dimensional connate topological superconductor is a unique system where the bulk interior of a two-dimensional material exhibits superconductivity while the edge simultaneously hosts a topologically nontrivial state. As a result, the bulk superconductivity induces superconductivity in the nontrivial edge states, giving rise to superconducting edge states. The goal of this project is to discover, develop, and electrostatically control connate topological superconductivity and the concomitant superconducting edge states in noncentrosymmetric, T’ and Td, two-dimensional superconductors. Connate topological superconductivity has been proposed for a number of bulk materials, but the experimental evidence for and manipulation of connate topological superconductivity has remained limited due to strong electronic screening caused by a large concentration of charge carriers across many atomic layers. Atomically thin T’ and Td superconductors with moderate charge carrier concentrations offer an opportunity to better understand and control connate topological superconductivity phenomena. Because of the low electronic screening, the behavior of two-dimensional connate topological superconductors may be tuned without introducing disorder via electrostatic gating. Realizing a connate topological superconductor and the associated superconducting edge states, which are beyond the scope of standard Bardeen-Cooper-Schrieffer theory, would give crucial insight into how superconductivity can emerge without strictly being facilitated by phonons and could be useful for engineering qubits with long coherence times.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：超导和基于量子的技术是实现更快、更高效的计算、节能电力传输以及增强材料计量能力的新方法的有前途的途径。实现此类技术量子态稳健读取的一种方案是将超导性与仅存在于材料边缘的电子态相结合，从而产生一种融合这两种特性的特殊状态：原生拓扑超导性。少层过渡金属二硫属化物是一种很有前途的材料子类，预计它们会表现出天然拓扑超导性，并且随着静电环境的适度变化而高度可调。 在该项目中，研究团队旨在发现、开发和静电控制半金属和超导过渡金属二硫属化物中的原生拓扑超导行为。该项目的成功将引入新的方法来探索新形式的超导性，并导致人们更深入地了解控制超导性的一般机制。此外，该项目将研究生和本科生纳入研究工作，并与当地学区的教师合作为 K-12 学生开发和开展外展活动。 技术摘要：二维共生拓扑超导体是一种独特的系统，其中二维材料的内部表现出超导性，而边缘同时具有拓扑非平凡状态。结果，体超导性在重要边缘态中诱发超导性，从而产生超导边缘态。该项目的目标是发现、开发和静电控制非中心对称 T' 和 Td 二维超导体中的原生拓扑超导性和伴随的超导边缘态。已经提出了许多块体材料的原生拓扑超导性，但由于许多原子层上大量集中的电荷载流子引起的强电子屏蔽，原生拓扑超导的实验证据和操纵仍然有限。具有中等载流子浓度的原子薄 T' 和 Td 超导体为更好地理解和控制原生拓扑超导现象提供了机会。由于低电子屏蔽，二维同生拓扑超导体的行为可以在不通过静电门控引入无序的情况下进行调整。实现天生拓扑超导体和相关的超导边缘态，超出了标准巴丁-库珀-施里弗理论的范围，将为了解超导如何在没有声子严格促进的情况下出现提供重要的见解，并且对于工程具有长相干时间的量子位可能有用。该奖项反映了 NSF 的法定使命，并通过使用 基金会的智力价值和更广泛的影响审查标准。