Interference effects in superconductor-quantum Hall hybrid structures

超导体-量子霍尔混合结构中的干涉效应

• 批准号: 2004870
• 负责人: Gleb Finkelstein
• 金额: $ 60万
• 依托单位: Duke University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2004870&HistoricalAwards=false
• 关键词: Interference; effects; superconductor; quantum; Hall

Non-technical Abstract:Present day electronic devices rely on the flow of charged electrons and holes. However, other types of quasiparticles, with entirely different electronic properties, can be artificially created and controlled. These quasiparticles, which include the so called “Majorana fermions”, have topological properties that protect them against perturbations from their environment. Over the past few years, the condensed matter community achieved dramatic progress in understanding and practical implementation of topological excitations, which promise to revolutionize electronics and to bring quantum computing closer to reality. This research explores topological states and excitations formed at the interfaces between two quintessential quantum states: the integer quantum Hall and superconductor. The project strongly emphasizes mentoring and education; it involves students across educational stages from high to graduate school. The students are trained in measurement and nanofabrication methods relevant for both industrial and academic careers. Technical Abstract:The interplay of the quantum Hall (QH) effect and superconductivity is expected to result in novel quantum states and excitations, such as Majorana fermions and parafermions. This research uses magneto-transport methods to explore quantum states formed at the 1D interfaces between quantum Hall states and a superconductor. Specifically, the project focuses on the following major directions: 1) investigation of chiral Andreev edge states, their coherence and interference properties, and their relation to Majorana fermions. 2) the study of Josephson junctions made of “twisted bilayer graphene” with superconducting contacts, in a search for Majorana zero modes and parafermions. The physics of topological excitations in superconducting quantum Hall systems presents fundamental interest and may bring topological quantum computation closer to reality. The project involves graduate, undergraduate, and high school students who are trained in measurement and nanofabrication methods relevant for both industrial and academic careers.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：当今的电子设备依赖于带电电子和空穴的流动。然而，其他类型的准粒子，具有完全不同的电子性质，可以人工创造和控制。这些准粒子，包括所谓的“马约拉纳费米子”，具有拓扑性质，可以保护它们免受环境的扰动。在过去的几年里，凝聚态社区在拓扑激发的理解和实际应用方面取得了巨大的进展，这有望彻底改变电子学并使量子计算更接近现实。本研究探讨在两个典型量子态：整数量子霍尔和超导体之间的界面处形成的拓扑态和激发。该项目非常强调辅导和教育;它涉及从高中到研究生院的各个教育阶段的学生。学生接受与工业和学术职业相关的测量和纳米制造方法的培训。技术摘要：量子霍尔（QH）效应和超导性的相互作用预计将导致新的量子态和激发，如马约拉纳费米子和副费米子。本研究使用磁输运方法来探索量子霍尔态与超导体之间的一维界面处形成的量子态。具体而言，该项目集中在以下主要方向：1）手征Andreev边缘态的研究，它们的相干性和干涉性质，以及它们与Majorana费米子的关系。2)研究由具有超导接触的“扭曲双层石墨烯”制成的约瑟夫森结，以寻找马约拉纳零模和副费米子。超导量子霍尔系统中的拓扑激发物理引起了人们的兴趣，并可能使拓扑量子计算更接近现实。该项目涉及研究生、本科生和高中生，他们接受了与工业和学术生涯相关的测量和纳米制造方法的培训。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进行评估，被认为值得支持。

项目成果

One-dimensional edge contact to encapsulated MoS 2 with a superconductor

超导体封装 MoS 2 的一维边缘接触

• DOI: 10.1063/5.0045009
• 发表时间: 2021
• 期刊: AIP Advances
• 影响因子: 1.6
• 作者: Seredinski, A.;Arnault, E. G.;Costa, V. Z.;Zhao, L.;Larson, T. F.;Watanabe, K.;Taniguchi, T.;Amet, F.;Newaz, A. K.;Finkelstein, G.
• 通讯作者: Finkelstein, G.

Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions

• DOI: 10.1021/acs.nanolett.2c01999
• 发表时间: 2022-08-23
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Arnault, Ethan G.;Idris, Sara;Amet, Francois
• 通讯作者: Amet, Francois

Graphene-Based Quantum Hall Interferometer with Self-Aligned Side Gates

具有自对准侧门的基于石墨烯的量子霍尔干涉仪

• DOI: 10.1021/acs.nanolett.2c03805
• 发表时间: 2022
• 期刊: Nano Letters
• 影响因子: 10.8
• 作者: Zhao, Lingfei;Arnault, Ethan G.;Larson, Trevyn F.;Iftikhar, Zubair;Seredinski, Andrew;Fleming, Tate;Watanabe, Kenji;Taniguchi, Takashi;Amet, François;Finkelstein, Gleb
• 通讯作者: Finkelstein, Gleb