CAREER: Quantum Transport and Optoelectronics with Helical Crystals

职业：螺旋晶体的量子传输和光电子学

• 批准号: 1848281
• 负责人: Hugh Churchill
• 金额: $ 54.52万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1848281&HistoricalAwards=false
• 关键词: CAREER; Quantum; Transport; Optoelectronics; Helical

Nontechnical abstract:The physical properties of materials, and consequently how those materials may be put to work for the benefit of society, is dictated by which elements compose the material and how each element is arranged within the structure of the material. When the elements selenium or tellurium bond together to form a crystal, the arrangement of the elements is rather unique: the atoms form tiny spiraling chains running in the same direction with many parallel chains weakly bonded together to create the crystal. Given this unusual structure, it is not surprising that many new physical properties could arise. The research team synthesizes these materials and incorporates them into electronic devices that create, control and probe the unusual properties. For example, as electrons travel along the spiraling chains, they are expected to generate a large magnetic field that could be useful for information storage and processing. As another example, stretching the spirals is expected to transform these materials from a semiconductor into a special type of metal in which new and useful quantum mechanical properties emerge. This activity is integrated into a broad scope of educational and community-building efforts aimed at training students to enter the quantum science and technology workforce, communicating physics to the general public, and inspiring young students, particularly those from underrepresented groups, to choose careers in science and engineering.Technical abstract:Topological band theory has revolutionized the understanding of what kinds of quantum states are possible in condensed matter settings, and this understanding has led to the experimental realization of many of these states, including various types of topological insulators and Dirac, Weyl, and Majorana fermions. While these quantum states have been investigated with increasing vigor over many years, the development of devices based on quantum materials remains in its infancy, particularly for Weyl and Majorana systems. Such devices could control, optimize, utilize, and further probe some of these states, as well as create new ones. This project converges materials synthesis, two-dimensional material heterostructures, and quantum device fabrication/measurement to revisit two materials, elemental selenium and tellurium, and probe them in a new light as quantum materials. The objective is to experimentally answer fundamental questions about the properties and capabilities of these materials spanning a broad range of topics: the kinetic magneto-electric effect; Fermi energy tuning, strain modification, and confinement of gapped Weyl materials; and heterostructures of tellurium and layered superconductors as a potential Majorana platform. Answers to these questions have the potential to establish trigonal Se and Te as premier quantum materials impacting a wide range of fundamental and applied topics including spintronics, valleytronics, topological (semi)metals, solar energy harvesting, and (topological) quantum information processing.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：材料的物理特性，因此，如何将这些材料用于社会的利益，这决定了元素构成材料以及如何在材料结构中排列的每个元素。 当元素的硒或泰瑞尔键合在一起形成晶体时，元素的排列相当独特：原子形成微小的螺旋链，沿着相同的方向延伸，许多平行链链条弱粘合在一起以形成晶体。 鉴于这种异常的结构，可能会出现许多新的物理特性并不奇怪。 研究团队合成了这些材料，并将它们纳入创建，控制和探测异常特性的电子设备中。 例如，当电子沿着螺旋链传播时，预计它们将产生一个可用于信息存储和处理的大磁场。 作为另一个例子，有望拉伸螺旋形将这些材料从半导体转换为一种特殊类型的金属，其中新的且有用的量子机械性能出现。 This activity is integrated into a broad scope of educational and community-building efforts aimed at training students to enter the quantum science and technology workforce, communicating physics to the general public, and inspiring young students, particularly those from underrepresented groups, to choose careers in science and engineering.Technical abstract:Topological band theory has revolutionized the understanding of what kinds of quantum states are possible in condensed matter settings, and this understanding has led to the experimental realization of这些州中的许多州，包括各种类型的拓扑绝缘子和狄拉克，Weyl和Majorana Fermions。尽管这些量子状态已经以越来越多的年份进行了研究，但基于量子材料的设备的开发仍处于起步阶段，尤其是对于Weyl和Majorana系统。这样的设备可以控制，优化，利用和进一步探测其中一些状态，并创建新的设备。该项目将材料合成，二维材料异质结构以及量子设备制造/测量汇总，以重新审视两种材料，即元素硒和泰瑞尔，并以新的光线作为量子材料探测它们。目的是实验回答有关这些材料的特性和能力的基本问题，这些材料涵盖了广泛的主题：动力学磁电效应；费米能量调整，应变修饰和隔开的Weyl材料的限制；以及柜和分层超导体作为潜在的Majorana平台的异质结构。 这些问题的答案有可能建立三角形和TE作为主要的量子材料，这些量子材料影响了广泛的基本和应用主题，包括Spintronics，Valleytronics，Valleytronics，拓扑（半）金属，太阳能收获以及（拓扑）量子信息处理。这些奖项通过NSF的法规及其范围进行了评估，这表明了NSF的范围和范围的范围。 标准。

项目成果

Tuning Supercurrent in Josephson Field-Effect Transistors Using h-BN Dielectric

• DOI: 10.1021/acs.nanolett.0c03183
• 发表时间: 2021-02-22
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Barati, Fatemeh;Thompson, Josh P.;Shabani, Javad
• 通讯作者: Shabani, Javad

Growth and Strain Engineering of Trigonal Te for Topological Quantum Phases in Non-Symmorphic Chiral Crystals

• DOI: 10.3390/cryst9100486
• 发表时间: 2019-10-01
• 期刊: CRYSTALS
• 影响因子: 2.7
• 作者: Basnet, Rabindra;Doha, M. Hasan;Hu, Jin
• 通讯作者: Hu, Jin

Giant topological Hall effect in centrosymmetric tetragonal Mn2−xZnxSb

• DOI: 10.1103/physrevb.104.174419
• 发表时间: 2021-11
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Md Rafique Un Nabi;A. Wegner;Fei Wang;Yanglin Zhu;Yingdong Guan;A. Fereidouni;K. Pandey;R. Basnet-R

Enhancement of 2D topological semimetal transport properties by current annealing

• DOI: 10.1063/5.0102933
• 发表时间: 2022-09
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: A. Fereidouni;M. Doha;K. Pandey;R. Basnet;J. Hu;H. Churchill