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

非技术总结这个DMREF项目的目的是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。这项研究可以开发出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，将由五名首席调查人员进行合作研究，他们专门从事各种技术和方法，包括作为先进磁性探针的中子散射(DAI)和Muon自旋弛豫(Uemura)，纳米系统(Ni和Kim)的合成和电荷传输，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，用多个实验探测器表征高质量的样品，使用纳米设备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。正如最近发现的铁磁半导体的晶体结构与铁基高温超导体相同，来自不同研究界的专家之间的相遇和连贯合作将带来意想不到的突破。自2011年以来，来自哥伦比亚大学和赖斯大学的PI为寻求更广泛影响的入门级研究生举办了现场/视频讲座课程《凝聚态物理的前沿》，并积累了约100场顶尖科学家描述现代固态物理研究的视频讲座。目前的项目将允许在这门课程中增加一个新的系列，涉及来自哥伦比亚大学、赖斯大学、哈佛大学、罗格斯大学和加州大学洛杉矶分校的教职员工，并将他们的教室与基于网络的技术连接起来，以进行同步广播。技术总结高T_c铜酸盐和铁基超导体的凝聚和配对机制尚未确定。然而，越来越多的迹象表明磁相互作用所起的重要作用。随着多探针实验研究人员使用中子、缪子、输运和扫描隧道显微镜(STM)，并辅之以与高级计算的定量比较，目前的DMREF项目将为探索非传统超导体提供新的曙光。结合先进计算方法的预测能力，对工作中的物理机制的更好理解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，这种超导体对与传统的化学取代掺杂相关的无序效应不那么敏感。通过电解液栅极电压调谐费米能级的输运结果将直接与关于电子结构的高级理论计算相比较。此外，非传统超导体及其磁性衍生物界面的形成，以及通过带场效应门控的电荷掺杂来设计相变，将导致具有新功能的器件，从而导致一个尚未探索的跨学科研究前沿。该项目将提供一种独特的协作体验，包括具有多个研究领域和技术的领先研究人员、研究生和博士后，这将为培养未来的现代物理研究领导者做出重要贡献。

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.