Correlated Quantum Phenomena at Superconductor/Magnetic Interfaces

超导/磁界面的相关量子现象

基本信息

批准号：
2218550
负责人：
Jagadeesh Moodera
金额：
$ 95万
依托单位：
Massachusetts Institute of Technology
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2022
资助国家：
美国
起止时间：
2022-09-01 至 2026-08-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2218550&HistoricalAwards=false
关键词：
Correlated Quantum Phenomena Superconductor Magnetic

项目摘要

Nontechnical abstract: Quantum materials and related technology have been the driving force for giant breakthroughs in physics in the recent decades. For future progress in the field it is essential to understand quantum materials at the atomic level. This research project will focus on combining two quantum systems, namely ferromagnets (FMs) and superconductors (SCs), to enable intriguing scientific inquiries such as the appearance of Majorana pair modes and exotic spin triplet SCs. These topics will be experimentally investigated at cryogenic temperatures using advanced probes, leading to developing practical topological qubits and forming the basis for building a robust, scalable quantum computer. This work will impact quantum materials development, medicine, technology, finance, communication, and national security. The outcome of this multidisciplinary research project also has the potential for leading developments in highly energy-conserving superconducting spintronics, and for advancing quantum information science and engineering. In the process, postdocs and students at all levels would be trained at the forefront of quantum science/technology and material physics. The project will open up ample opportunities for initiating new theoretical and experimental collaborations worldwide, including advanced atomic level interface characterization at national laboratories. This will provide opportunities to the students including high school summer interns for scientific interaction with national and international scientists, and for enriching students' educational and outreach activities, both online and in-person.Technical Abstract: The project aims at investigating quantum phenomena at atomically resolved hybrid interfaces. Interface driven effects are pivotal in quantum materials study, a focus of this project. This study intends to understand and manipulate correlated effects in hybrid system by combining the quantum systems - ferromagnets (FMs) and superconductors (SCs) at the atomic level. This approach enables the study of signature interfacial exchange interaction, leading to establishing the Majorana bound state pair and their entanglement/teleportation, as well as the spin triplet Cooper pairing in SCs. Following the theoretical prediction, gold (111) surface state with its large spin orbit splitting in conjunction with a large gap SC, is an ideal platform for seeking the simultaneous Majorana pair appearance and understanding the parameters that define the intrinsic behavior/stability. For the triplet pair study the ferromagnetic Ni, EuS or GdN would be proximity-coupled to Ga, Bi or SCs such as Al or NbN, creating model systems for controlled study. To reach the goal, MBE-grown thin film heterostructures, scanning tunneling spectroscopy and high field as well as cryogenic magneto-transport studies would be carried out. The project will lead to a scalable, coherent topological qubit development, and an ideal dissipationless spin polarized source for superconducting spintronics, and the results will impact the field of quantum information science and engineering. Project involves postdocs and students to be trained in multidisciplinary areas at the forefront of quantum science, material physics and nanodevice technology. Opportunities are created for initiating theoretical and experimental collaborations worldwide in interface characterization at national laboratories. Outreach, education and broadening participation efforts in STEM address the needs of undergraduates and high school students, while promoting scientific education.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：近几十年来，量子材料和相关技术一直是物理学巨大突破的推动力。对于该领域的未来进步，必须在原子水平上了解量子材料。该研究项目将着重于组合两个量子系统，即铁磁铁（FMS）和超导体（SCS），以实现有趣的科学询问，例如Majorana Pair Modes和Extocit Spin Triplet SC的出现。这些主题将在低温温度下使用先进的探针进行实验研究，从而导致开发实用的拓扑量表，并为构建可稳固的可扩展量子计算机构成基础。这项工作将影响量子材料开发，医学，技术，金融，通讯和国家安全。这个多学科研究项目的结果还具有领导高度能源持续的超导Spintronics以及推进量子信息科学和工程学的潜力。在此过程中，各个级别的博士后和学生将在量子科学/技术和材料物理学的最前沿进行培训。该项目将为全球启动新的理论和实验合作启动新的机会，包括在国家实验室的先进原子级界面表征。这将为包括高中暑期实习生在内的学生提供与国家和国际科学家进行科学互动的机会，并丰富了学生的教育和外展活动，包括在线和亲自面对面。技术摘要：该项目旨在研究原子上解决的混合界面的量子现象。界面驱动的效应在量子材料研究中是关键的，这是该项目的重点。这项研究打算通过在原子水平结合量子系统（FMS）和超导体（SCS）来理解和操纵混合系统中的相关效应。这种方法可以研究签名界面交换相互作用，从而导致建立Majorana Bound State对及其纠缠/传送，以及SC中的Spin Triplet Cooper配对。遵循理论预测，黄金（111）表面状态具有大型的旋转轨道分裂与大间隙SC的结合，是寻求同时发生的Majoraga对外观并了解定义内在行为/稳定性的参数的理想平台。对于三胞胎对研究，铁磁Ni，EUS或GDN将与GA，BI或SC（例如Al或NBN）接近耦合，从而创建用于对照研究的模型系统。为了达到目标，将进行MBE成长的薄膜异质结构，扫描隧道光谱和高场以及低温磁通型研究。该项目将导致可扩展的，连贯的拓扑Qubit开发，以及用于超导旋转的理想无自旋偏光源，结果将影响量子信息科学与工程领域。项目涉及在量子科学，材料物理学和纳米电视技术最前沿的多学科领域接受培训的博士后和学生。创建了机会，用于在全球范围内在国家实验室进行界面表征的理论和实验合作。在促进科学教育的同时，宣传，教育和扩大参与工作解决了本科生和高中生的需求。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估评估评估标准来通过评估来支持的。