CAREER: Determining the Role of Intertwined Orders in Superconducting Quantum Materials

职业：确定交织有序在超导量子材料中的作用

• 批准号: 2034345
• 负责人: Eduardo da Silva Neto
• 金额: $ 50.53万
• 依托单位: Yale 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: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2034345&HistoricalAwards=false
• 关键词: CAREER; Determining; Role; Intertwined; Orders

Non-Technical AbstractThe origin of electrical resistance in simple metals is well-described by a model in which electrons behave like independent billiard balls colliding within the material, and losing energy in the process. On the other hand, in superconducting quantum materials many electrons behave collectively to create a state where electric current can flow without energy loss. In many cases, these quantum materials may feature enhanced properties that defy our conventional knowledge, and could be key to the future of clean energy transmission and other everyday technologies. However, as one tries to enhance superconductivity, other phenomena, including ordered states, appear as well. The fundamental roadblock is to understand how these additional intertwined orders are detrimental or helpful to the superconductivity. This project uses complementary scanning tunneling microscopy and spectroscopy, a tool that visualizes the electrons in the sub-nanoscale, and resonant x-ray scattering to investigate the role of intertwined orders in superconducting quantum materials, while manipulating the materials using a variety of conditions like external field or temperature. This project also uses online tools for the broader dissemination of knowledge. Several online video modules, featuring undergraduate and graduate students, demonstrate and explain the advanced laboratory techniques related to this project. This project also targets the inclusion of underrepresented minorities through the development of teaching modules for the Mentorships for Undergraduate Research Participants in the Physical and Mathematical Sciences program at UC Davis.Technical AbstractUnderstanding how quantum materials develop collective electronic phenomena is one of the biggest challenges facing condensed matter physicists today. The key to unlocking quantum materials comes from understanding how multiple phases are intrinsically intertwined and cannot exist alone. In quantum materials, superconductivity may intertwine with phases where electrons self-organize into unusual patterns (density waves) or into states where the x and y directions become nonequivalent for electrons in an otherwise square crystal (nematic order). This project investigates the role of intertwined orders in unconventional superconductors, focusing on two important cases : (i) studies of the relationship between density-wave order, magnetism and superconductivity in the Ce-based 115 family of heavy-fermion superconductors using scanning tunneling microscopy and spectroscopy (STM/S) and resonant x-ray scattering techniques; and (ii) studies of superconducting and nematic orders in Fe-based superconductors by integrating STM/S and uniaxial strain to control the nematic order. Through these activities, this research ultimately targets the direct visualization of a pair-density-wave state in a heavy fermion superconductor and the switchable control of superconductivity by crystal deformation of Fe-based superconductors. Finally, the development of a new methodology to study nematic order via the integration of uniaxial strain to STM/S will have significant impact on the study of other quantum 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.

非技术抽象的简单金属中电阻的起源是通过模型很好地描述的，在该模型中，电子的行为就像材料中碰撞的独立台球球，并在此过程中失去能量。另一方面，在超导量子材料中，许多电子的行为共同创建了一个状态，即电流可以流动而不会损失能量。在许多情况下，这些量子材料可能具有增强的特性，可以违背我们的常规知识，并且可能是清洁能源传播和其他日常技术的未来的关键。但是，由于人们试图增强超导性，其他现象（包括有序状态）也出现。基本的障碍是了解这些额外的交织订单如何有害或有助于超导性。该项目使用互补的扫描隧道显微镜和光谱学，该工具可视化亚纳米级中的电子以及谐振X射线散射，以研究相互交织的订单在超导量子材料中的作用，同时使用多种条件（如多种条件）操纵材料外场或温度。该项目还使用在线工具来更广泛地传播知识。几个在线视频模块，包括本科生和研究生，展示并解释了与该项目相关的高级实验室技术。该项目还针对加州大学戴维斯分校的物理和数学科学计划中的本科研究参与者的指导参与者的指导，包括少数群体，包括量子材料如何发展集体电子现象是汇总的最大挑战之一，今天的物理学家。解锁量子材料的关键来自理解多个阶段在本质上的交织方式而不能单独存在。在量子材料中，超导性可能会与相结合的相结合，其中电子会自组织成异常的模式（密度波），也可以分为X和Y方向在原本方形晶体（nematic Order）中的电子不当的状态。该项目研究了相互论来的订单在非常规超导体中的作用，重点介绍了两种重要情况：（i）使用扫描隧道显微镜的基于CE的115个重物较重的超级导体的密度波顺序，磁性和超导性之间的关系光谱法（STM/S）和谐振X射线散射技术； （ii）通过整合STM/S和单轴菌株来控制列表，研究了基于Fe的超导体中的超导和列表。通过这些活动，这项研究最终靶向了沉重的费米昂超导体中成对密度波状态的直接可视化，以及通过基于Fe的超导体的晶体变形对超导性的可切换控制。最后，开发一种通过将单轴应变与STM/S整合进行研究的新方法，将对其他量子材料的研究产生重大影响。该奖项反映了NSF的法定任务，并被认为是通过使用评估的支持，基金会的智力优点和更广泛的影响审查标准。

项目成果

Large response of charge stripes to uniaxial stress in La1.475Nd0.4Sr0.125CuO4

• DOI: 10.1103/physrevresearch.3.l022004
• 发表时间: 2021-04-09
• 期刊: PHYSICAL REVIEW RESEARCH
• 影响因子: 4.2
• 作者: Boyle, T. J.;Walker, M.;Blanco-Canosa, S.
• 通讯作者: Blanco-Canosa, S.

Enhanced charge density wave coherence in a light-quenched, high-temperature superconductor

• DOI: 10.1126/science.abd7213
• 发表时间: 2020-03
• 期刊: Science
• 影响因子: 56.9
• 作者: S. Wandel;F. Boschini;E. H. da Silva Neto;L. Shen;M. Na;S. Zohar;Y. Wang;S. B. Welch;M. Seaberg;J. Koralek;G. Dakovski;W. Hettel;M.-F. Lin;S. Moeller;W. Schlotter;A. Reid;M. Minitti;T. Boyle;F. He;R. Sutarto;R. Liang;D. Bonn;W. Hardy;R. Kaindl;D. Hawthorn;J. Lee;A. Kemper;A. Damascelli;C. Giannetti;J. J. Turner-J.;G. Coslovich