Local Moment and Heavy Fermion Physics

局域矩和重费米子物理

• 批准号: 0605935
• 负责人: Piers Coleman
• 金额: $ 36.6万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0605935&HistoricalAwards=false
• 关键词: Local; Moment; Heavy; Fermion; Physics

This grant is for the support of the core condensed matter theory research and education activities of Piers Coleman, along with the participation of senior personnel collaborator, Professor Elihu Abrahams. Intellectual Merit: Heavy electron and local moment physics occupy a vital corner in current research into correlated electron materials. Many of the key questions touch upon issues of fundamental importance to the condensed matter community, such as the physics of quantum criticality, mechanisms of anisotropic superconductivity, and the origins of non-Fermi liquid behavior. This makes it an ideal training ground for students of condensed matter physics. The PI's recent success in applying the Schwinger boson to fully screened Kondo models opens up a unique opportunity to connect magnetism and heavy electron physics, an important component of this project. The recent discovery of the charge Kondo effect in doped PbTe, confirming a past prediction of the PI, motivates a new program to adapt tools and concepts from magnetism and spin physics to systems with preformed pairs and slow charge fluctuations. Lastly, the recent discovery of a two dimensional heavy fermion behavior in bilayer 3He, provides the motivation for a new study of heavy fermion behavior in two dimensions.Broader Impact: Research into the various aspects of "hard condensed matter physics" plays an essential driving role in both the development of new physics concepts, and new ideas for the development of materials of the future. For example, the remarkable tendency of quantum critical points to nucleate new phases of matter is of great interest to materials development; on the other hand, the new universality classes of quantum phase transition are of great fundamental interest and, like their classical predecessors in statistical mechanics, may enjoy generalization and future application in the realm of cosmology and particle physics. This is a great area for students to learn the advanced methods of theoretical physics, while maintaining an intimate contact with experimental physics and real materials. The work described in this proposal will contribute modestly to the growth of our understanding of correlated matter, helping the experimentalist to develop new probes and forging new conceptual frameworks that complement the older approaches of solid state physics.The PI aims to focus his studies on: quantum phase transitions in heavy electron systems; transport and electrodynamics of valence skipping materials; heavy fermion physics in two dimensional bilayer 3He on graphite; and superconductivity in the layered 115 materials.Non-Technical Abstract: This grant supports theoretical research and education in condensed matter physics. The research is fundamental and has high intellectual merit in that the results will advance the progress of condensed matter physics and also may influence other fields of physics. Novel phenomena discovered in these systems may lead to materials for future devices. The project includes the participation of students and postdoctoral associates. The principal investigator is an effective spokesman for condensed matter physics both within this community and with the general public.The research will focus on the behavior of electrons in special classes of materials in which they behave as if their mass is many times their real mass. Hence these materials are called heavy electron materials. These "heavy electrons" are intricately connected with the superconducting, magnetic and electronic properties of theses materials. Trying to understand their behavior presents many intellectual challenges, yields many surprises, and lays the foundations for understanding how the interactions among electrons in a material can lead to new phenomena.

这项赠款是为了支持核心凝聚力理论理论研究和教育活动，以及高级人事合作者Elihu Abrahams教授的参与。知识分子优点：重型电子和当地力矩物理学在当前对相关电子材料的研究中占据了一个重要角落。许多关键问题涉及对冷凝物质社区至关重要的问题，例如量子关键的物理学，各向异性超导性的机制以及非Fermi液体行为的起源。这使其成为凝结物理学学生的理想培训场所。 PI最近在应用Schwinger Boson上进行全面筛选的Kondo模型的成功开辟了一个独特的机会，可以将磁力和重型电子物理学连接起来，这是该项目的重要组成部分。最近发现了掺杂的PBTE的电荷近藤效应，证实了PI的过去预测，激发了一个新程序，以使工具和概念从磁性和旋转物理学到具有预成式成对和缓慢电荷波动的系统。最后，最近发现BiLayer 3HE中二维重型费米的行为，为对二维的重型费米亚行为进行了新的研究提供了动力。BROADER的影响：研究“硬凝结物理学”的各个方面的研究是必不可少的驱动器在新物理概念的发展中的作用以及未来材料发展的新思想。例如，量子关键点对物质的新阶段的显着趋势引起了材料发育的极大关注。另一方面，量子相变的新通用类别具有极大的基本兴趣，就像它们在统计力学中的经典前辈一样，也可能在宇宙学和粒子物理学领域中享有概括和未来的应用。 这是学生学习理论物理学先进方法的好领域，同时保持与实验物理和真实材料的亲密接触。本提案中描述的工作将有助于我们对相关物质的理解的增长，从而帮助实验者开发新的探针并建立新的概念框架，以补充固态物理学较旧的方法。重电子系统中的量子相变；价跳过材料的运输和电动力学；在石墨上的二维双层二维双层中的沉重效率物理；以及分层的115材料中的超导性。非技术摘要：该赠款支持凝聚态物理学的理论研究和教育。 这项研究是基本的，并且具有很高的智力优点，因为结果将推动凝结物理学的进步，并且可能影响其他物理领域。 在这些系统中发现的新现象可能会导致未来设备的材料。 该项目包括学生和博士后员工的参与。 首席研究者是该社区内部和公众中凝结物理学的有效发言人。研究将重点关注电子在特殊类别的材料中的行为，在这些材料中，他们的行为，好像他们的质量是他们真正的质量。 因此，这些材料称为重电子材料。 这些“重型电子”与这些材料的超导，磁性和电子特性无关紧要。 试图理解他们的行为带来了许多智力挑战，产生了许多惊喜，并为了解材料中电子之间的相互作用如何导致新现象的基础。