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Transport and Optical Phenomena in Correlated Electron Systems

相关电子系统中的传输和光学现象

基本信息

批准号：
2224000
负责人：
Dmitrii Maslov
金额：
$ 40万
依托单位：
University of Florida
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2022
资助国家：
美国
起止时间：
2022-12-01 至 2025-11-30
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2224000&HistoricalAwards=false
关键词：
Transport Optical Phenomena Correlated Electron

项目摘要

NONTECHNICAL SUMMARYThis award theoretical research on transport and optical properties of materials with unconventional electronic behavior. Investigations of transport and optical phenomena in condensed matter systems provides invaluable information about the dynamics of electrons and how they interact with each other and atomic vibrations. However, the analysis and interpretation of abundant experimental data is never straightforward and, quite often, challenging, due to a multitude of competing processes. One encounters such challenges even when describing electron transport in simple conventional metals, such as copper and aluminum, where electrons behave as almost free particles. Analysis becomes even more complicated in materials where strong electron-electron interaction erases any similarities with the free-electron picture. In this project, the PI and his team will investigate transport and optical properties of several unconventional systems, such as those where the strong interaction leads to a linear temperature dependence of the resistivity, systems where the electron's energy depends on its momentum in a linear fashion, and materials in which the spontaneous alignment of electric dipole moments is overcome by the quantum motion of the atoms. Studying these puzzling systems is not only important for advancing our scientific understanding of materials in general, but they could also potentially lead to technological innovations in the future, such as in lossless transmission of electricity and quantum information science.This award also supports educational and outreach activities. The PI will develop new moduli on subjects relevant to this award for a multi-faculty course on Advanced Topics in Condensed Matter Physics, adopt and revamp a joint History/Physics course that offers a dual exploration of physics discoveries from scientific and historical points of view, organize various workshops and conferences, and work on a new book on Quantitative Methods in Physics aimed at upper-undergraduate and graduate students. TECHNICAL SUMMARYThis project entails theoretical research on transport and optical properties of unconventional electronic systems. The research has three main objectives. In the first thrust, the PI and his team will focus on the theory of spin collective modes in bilayer graphene with proximity-induced Rashba and valley-Zeeman types of spin-orbit coupling, which will provide a new development in the Fermi-liquid theory with multiple electron valleys, spin-momentum locking, and non-Abelian Berry curvature. The second objective is to develop a detailed theory of intrinsic optical absorption in Dirac and Weyl semi-metals, induced by electron-electron and electron-hole interactions. At the first stage of this effort, the PI’s group will study optical absorption in model systems, at the level of low-energy single-particle Hamiltonians, accompanied by both Hubbard and Coulomb interaction. Subsequently, the group will turn to more realistic, material-dependent Hamiltonians and make specific predictions for optical absorption in real materials. The third objective is to describe theoretically several puzzling phenomena observed in doped quantum paraelectrics such as strontium titanate. The topics to be addressed within this objective include (i) the origin of the quadratic-in-temperature behavior of the resistivity; (ii) a proper description of charge and heat transport in a thermal metal without quasiparticles, and beyond the Planckian limit, (iii) the origin of a strong temperature dependence of the effective mass, as measured by optics and thermoelectric effect; and (iv) the origin of quasi-linear and quasi-isotropic magnetoresistance.This award also supports educational and outreach activities. The PI will develop new moduli on subjects relevant to this award for a multi-faculty course on Advanced Topics in Condensed Matter Physics, adopt and revamp a joint History/Physics course that offers a dual exploration of physics discoveries from scientific and historical points of view, organize various workshops and conferences, and work on a new book on Quantitative Methods in Physics aimed at upper-undergraduate and graduate students.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.

非技术性总结该奖项旨在研究具有非常规电子行为的材料的传输和光学性质。对凝聚态系统中的传输和光学现象的研究提供了有关电子动力学以及它们如何相互作用和原子振动的宝贵信息。然而，大量实验数据的分析和解释从来都不是简单的，而且往往是具有挑战性的，因为有许多相互竞争的过程。即使在描述简单的传统金属（如铜和铝）中的电子输运时，人们也会遇到这样的挑战，在这些金属中，电子表现为几乎自由的粒子。在强电子-电子相互作用消除了与自由电子图像的任何相似性的材料中，分析变得更加复杂。在这个项目中，PI和他的团队将研究几个非常规系统的传输和光学特性，例如强相互作用导致电阻率线性温度依赖性的系统，电子能量以线性方式依赖于其动量的系统，以及电偶极矩自发排列被原子量子运动克服的材料。研究这些令人困惑的系统不仅对推进我们对材料的科学理解很重要，而且它们还可能在未来导致技术创新，例如电力的无损传输和量子信息科学。该奖项还支持教育和推广活动。PI将为凝聚态物理学高级主题的多学科课程开发与该奖项相关的科目的新模块，采用和改造联合历史/物理课程，从科学和历史的角度提供物理发现的双重探索，组织各种研讨会和会议，并致力于一本关于物理学定量方法的新书，目标是高年级本科生和研究生。本项目涉及非常规电子系统的输运和光学性质的理论研究。这项研究有三个主要目标。在第一个推力中，PI和他的团队将专注于双层石墨烯中的自旋集体模式理论，具有邻近诱导的Rashba和valley-Zeeman类型的自旋轨道耦合，这将为费米液体理论提供新的发展，具有多个电子谷，自旋动量锁定和非阿贝尔Berry曲率。第二个目标是发展一个详细的理论，在狄拉克和外尔半金属，诱导电子-电子和电子-空穴相互作用的本征光吸收。在这项工作的第一阶段，PI的小组将研究模型系统中的光吸收，在低能单粒子哈密顿量的水平上，伴随着哈伯德和库仑相互作用。随后，该小组将转向更现实的，材料相关的哈密顿算符，并对真实的材料中的光吸收进行具体的预测。第三个目标是从理论上描述在掺杂的量子顺电体如钛酸锶中观察到的几个令人困惑的现象。在这一目标范围内要解决的问题包括：（i）电阻率的温度二次行为的起源;（ii）没有准粒子和超过普朗克极限的热金属中的电荷和热输运的正确描述;（iii）通过光学和热电效应测量的有效质量的强温度依赖性的起源;及（iv）准线性及准各向同性磁电阻的起源。此奖项亦支持教育及外展活动。PI将为凝聚态物理学高级主题的多学科课程开发与该奖项相关的主题的新模块，采用并改进联合历史/物理课程，从科学和历史的角度提供物理发现的双重探索，组织各种研讨会和会议，并致力于一本关于物理学定量方法的新书，该奖项反映了NSF的法定使命，并通过使用基金会的智力价值进行评估，被认为值得支持和更广泛的影响审查标准。