DMREF/Collaborative Research: Designing, Understanding and Functionalizing Novel Superconductors and Magnetic Derivatives

非技术总结DMREF项目旨在在理解和设计新型超导体、磁性半导体和其他磁性材料方面取得突破。 该研究可以导致开发具有更高转变温度的材料，适用于具有新功能的电子器件。 为了实现这一目标，将由五名主要研究员（PI）进行合作研究，专门研究各种技术和方法，包括中子散射（Dai）和μ子自旋弛豫（Uemura）作为先进的磁性探针，纳米尺度系统的合成和电荷传输（Ni和Kim）以及理论和计算材料设计（Kotliar）。 团队成员将联合他们的力量和专业知识，用多个实验探针表征高质量的样品，使用纳米级器件探索电荷载流子的电场效应掺杂，使用先进的计算模型解释结果，并设计和合成新材料。 正如最近发现的具有与铁基高温超导体相同的晶体结构的铁磁半导体所证明的那样，来自不同研究领域的专家之间的接触和协调合作将导致意想不到的突破。 自2011年以来，来自哥伦比亚和赖斯的PI为入门级研究生组织了现场/视频讲座课程“凝聚态物理学前沿”，以寻求更广泛的影响，并积累了约100个领先的科学家描述固态物理学现代研究的视频讲座。 目前的项目将允许增加一个新的系列，这门课程涉及教师从哥伦比亚，赖斯，哈佛，罗格斯大学和加州大学洛杉矶分校和连接他们的教室与基于网络的技术同步广播。技术总结高Tc铜氧化物和铁基超导体的凝聚和配对机制尚未建立。 然而，越来越多的迹象表明，磁相互作用发挥了重要作用。 通过使用中子，μ子，传输和扫描隧道显微镜（STM）的多探针实验研究人员，辅以与先进计算的定量比较，目前的DMREF项目将为理解非常规超导体的探索提供新的思路。 结合先进计算方法的预测能力，更好地理解工作中的物理机制将有助于设计具有更高转变温度的材料。 利用电场效应的载流子掺杂将为寻找新型超导体提供一条新的途径，这种超导体对与化学取代的常规掺杂相关的无序效应不太敏感。 通过电解质栅极电压的费米能级调谐的运输结果将直接比较先进的理论计算的电子结构。 此外，非常规超导体及其磁性衍生物的界面的形成，以及通过电荷掺杂与场效应门控的相变工程，将导致具有新功能的设备，从而导致尚未探索的跨学科研究前沿。 该项目将提供一个独特的合作经验，涉及领先的研究人员，研究生和博士后与多个研究领域和技术，将作出重要贡献的现代物理研究的未来领导者的发展。

NON-TECHNICAL SUMMARYThis DMREF project aims to make breakthroughs in understanding and designing novel superconductors, magnetic semiconductors, and other magnetic materials. The research can lead to development of materials with higher transition temperatures suitable for applications to electronic devices with novel functionalities. To achieve this goal, collaborative research will be performed by five Principal Investigators (PIs) specializing in a variety of techniques and methods, including neutron scattering (Dai) and muon spin relaxation (Uemura) as advanced magnetic probes, synthesis and charge transport of nano-scale systems (Ni and Kim), and theory and computational material design (Kotliar). The team members will unite their forces and expertise to characterize high-quality specimens with multiple experimental probes, to explore electric field-effect doping of charge carriers using nano-scale devices, to interpret the results using advanced computational models, and to design and synthesize new materials. As demonstrated in recent discoveries of ferromagnetic semiconductors that have crystal structures identical to those of Fe-based high-Tc superconductors, encounters and coherent collaboration between experts from different research communities will lead to unanticipated breakthroughs. Since 2011, the PIs from Columbia and Rice have organized live/video lecture courses for entry-level graduate students "Frontiers of Condensed Matter Physics" seeking broader impact, and have accumulated about 100 video lectures of leading scientists describing modern studies of solid state physics. The present project will allow adding a new series to this course involving faculty members from Columbia, Rice, Harvard, Rutgers, and UCLA and connecting their classrooms with a web-based technology for simultaneous broadcast. TECHNICAL SUMMARYCondensation and pairing mechanisms of high-Tc cuprate and iron-based superconductors have not yet been established. However, there are growing signatures pointing toward the important role played by magnetic interactions. With multi-probe experimental researchers using neutrons, muons, transport, and scanning tunneling microscopy (STM), supplemented by quantitative comparison to advanced computation, the present DMREF project will shed new light on the quest for understanding unconventional superconductors. In conjunction with the predictive powers of advanced computational methods, a better understanding of the physical mechanisms at work will contribute to the ability to design materials with higher transition temperatures. Carrier doping using electric field effects will provide a new route to search for novel superconductors, less sensitive to disorder effects associated with conventional doping with chemical substitutions. Transport results on Fermi-level tuning via electrolyte gate voltage will be directly compared to advanced theoretical computations on electronic structures. Additionally, the formation of interfaces of unconventional superconductors and their magnetic derivatives, and engineering of phase changes via charge-doping with field-effect gating, will result in devices with novel functionality, leading to an as yet unexplored interdisciplinary research front. This project will provide a unique collaborative experience involving leading researchers, graduate students, and postdocs with multiple research fields and techniques that will make important contributions to the development of the future leaders of modern physics research.