Collaborative Research: High-dimensional quantum states in two-dimensional material quantum dots

合作研究：二维材料量子点中的高维量子态

• 批准号: 2105139
• 负责人: Fan Zhang
• 金额: $ 24万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2105139&HistoricalAwards=false
• 关键词: Collaborative; Research; dimensional; quantum; states

Nontechnical Abstract:This collaborative project studies special materials known as two-dimensional materials such as metal chalcogenides. Recent predictions indicate that these materials have interesting properties. The project aims to develop these properties using externally applied electric and magnetic fields in order to gain knowledge that will promote development of quantum information processing and quantum computing technologies. The project is integrated with educational activities to train graduate students and involve undergraduate and pre-college students in research. The project also enables the PIs to continue their successful mentoring of members from underrepresented groups.Technical Abstract:A basic building block of quantum circuits is the quantum bit or qubit. Recent recognition that higher-dimensional quantum states known as qudits have many potential advantages towards quantum information processing has generated much focus on this topic. These pertain to areas such as quantum simulation, quantum communications, fundamental tests of quantum mechanics, and improved quantum error correction. This project uses two-dimensional metal chalcogenides’ unique band structures comprising multiple valleys to realize high-dimensional quantum qudit states based on multiple flavor degrees of freedom. These materials have a predicted flavor SU(3) symmetry, of particular interest because of the analogy to the quark model in particle physics, and this symmetry is extremely rare in condensed matter systems. The project experimentally tests predictions for novel tunable Kondo effects and Coulomb blockade behavior emerging from this symmetry. The project also performs experiments aimed at manipulating these flavor states to develop qudits towards quantum information processing based on flavortronics. These research activities are coupled with a parallel theoretical effort that informs the experimental one, leading to a synergistic effort aimed at the development of high-dimensional quantum states based on beyond-graphene two-dimensional materials.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.

摘要：本合作项目研究金属硫族化合物等特殊材料，即二维材料。最近的预测表明，这些材料具有有趣的特性。该项目旨在利用外部施加的电场和磁场来开发这些特性，以获得促进量子信息处理和量子计算技术发展的知识。该项目与教育活动相结合，以培养研究生，并让本科生和大学预科学生参与研究。该项目还使pi能够继续成功地指导来自代表性不足群体的成员。技术摘要：量子电路的基本组成部分是量子比特或量子位。最近，人们认识到高维量子态（qudits）在量子信息处理方面具有许多潜在的优势，这引起了人们对这一主题的关注。这些涉及的领域包括量子模拟、量子通信、量子力学的基本测试和改进的量子纠错。本项目利用二维金属硫族化合物独特的包含多个谷的能带结构，实现基于多风味自由度的高维量子量子位态。这些材料具有预测的SU(3)对称性，特别有趣的是，它与粒子物理学中的夸克模型类似，而这种对称性在凝聚态系统中极为罕见。该项目通过实验测试了对新型可调近藤效应和库仑封锁行为的预测，这些预测来自于这种对称性。该项目还进行了旨在操纵这些风味状态的实验，以开发基于风味电子学的量子信息处理。这些研究活动与平行的理论工作相结合，为实验工作提供信息，从而产生协同努力，旨在开发基于石墨烯以外二维材料的高维量子态。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识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

Uncovering Topological Edge States in Twisted Bilayer Graphene

揭示扭曲双层石墨烯中的拓扑边缘态

• DOI: 10.1021/acs.nanolett.2c01481
• 发表时间: 2022
• 期刊: Nano Letters
• 影响因子: 10.8
• 作者: Fortin-Deschênes, Matthieu;Pu, Rui;Zhou, Yan-Feng;Ma, Chao;Cheung, Patrick;Watanabe, Kenji;Taniguchi, Takashi;Zhang, Fan;Du, Xu;Xia, Fengnian
• 通讯作者: Xia, Fengnian

Impact of Electric Field Disorder on Broken-Symmetry States in Ultraclean Bilayer Graphene

电场无序对超净双层石墨烯破缺对称态的影响

• DOI: 10.1021/acs.nanolett.2c02119
• 发表时间: 2022
• 期刊: Nano Letters
• 影响因子: 10.8
• 作者: Geisenhof, Fabian R.;Winterer, Felix;Seiler, Anna M.;Lenz, Jakob;Zhang, Fan;Weitz, R. Thomas
• 通讯作者: Weitz, R. Thomas

Evidence for Dirac flat band superconductivity enabled by quantum geometry

• DOI: 10.1038/s41586-022-05576-2
• 发表时间: 2023-02
• 期刊: Nature
• 影响因子: 64.8
• 作者: Haidong Tian;Xue-Jian Gao;Yuxin Zhang;S. Che;Tianyi Xu;Patrick Cheung;Kenji Watanabe;T. Taniguchi;M. Randeria;Fan Zhang;C. N. Lau;M. Bockrath

Quantum cascade of correlated phases in trigonally warped bilayer graphene

• DOI: 10.1038/s41586-022-04937-1
• 发表时间: 2022-08-11
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Seiler, Anna M.;Geisenhof, Fabian R.;Weitz, R. Thomas
• 通讯作者: Weitz, R. Thomas

Evidence of a room-temperature quantum spin Hall edge state in a higher-order topological insulator

高阶拓扑绝缘体中室温量子自旋霍尔边缘态的证据

• DOI: 10.1038/s41563-022-01304-3
• 发表时间: 2022-07-14
• 期刊: NATURE MATERIALS
• 影响因子: 41.2
• 作者: Shumiya, Nana;Hossain, Md Shafayat;Hasan, M. Zahid
• 通讯作者: Hasan, M. Zahid