Local Moment and Heavy Fermion Physics

局域矩和重费米子物理

• 批准号: 0312495
• 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: 2003
• 资助国家: 美国
• 起止时间: 2003-06-15 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0312495&HistoricalAwards=false
• 关键词: Local; Moment; Heavy; Fermion; Physics

This theoretical research is in the area of heavy electron physics. This subject occupies a modest yet vital corner in current research into correlated materials. Many of the fundamental questions, such as how magnetism emerges and the nature of the non-Fermi liquid metal that develops around quantum criticality, are pressing problems to the field as a whole. Part of the work to be undertaken is motivated by a new range of experiments that fine-tune heavy fermion materials to a quantum phase transition. The development of new techniques, models and concepts to understand heavy electron materials and their critical behavior is a central element of this research.The following subjects will be studied:Field-tuned quantum criticality: The underscreened Kondo impurity model provides an example of field-tuned quantum criticality, with a Fermi temperature which can be driven continuously to zero. Using a lattice generalization of this model as a starting point, we will model the evolution of magnetically heavy electron systems in their approach to quantum criticality.Frustrated heavy electron materials: We will study the interplay of frustration and the Kondo effect in Hund's coupled transition metal oxides.Hidden order and nodal charge density wave formation: We will study two band systems to develop a theory for hidden order in URu2Si2.A new Z2 Majorana approach to local moment physics: This will allow us to read-off spin correlators from the Majorana propagator, avoiding vertex correction difficulties encountered in conventional schemes. This new method will be applied to the single impurity and lattice Kondo model.Density of state correlations in pseudogap systems: Inspired by the analogy with the Brown-Twiss interferometry of astrophysics, we will develop a method to extract information order parameter correlations from density of state fluctuations measured in scanning tunneling microscopy.%%%This grant supports theoretical research on the physics of strongly correlated heavy electron systems. The research is at the forefront of modern condensed matter physics and will contribute to the foundations of fundamental physics. The participation of graduate students and postdoctoral research associates will ensure that future generations of theorists will be trained in these important areas. Like much of condensed matter physics, the research also has the potential to influence the development and applications of new materials.***

这项理论研究是在重型电子物理学领域。 在当前对相关材料的研究中，该主题占据了一个适中但至关重要的角落。 许多基本问题，例如磁性如何出现以及围绕量子关键性发展的非Fermi液体金属的性质，都在整个领域都迫使问题。 要进行的部分工作是由新的实验范围进行的，这些实验将重型费米材料微调为量子相变。 新技术，模型和概念以了解重型电子材料及其临界行为是这项研究的核心要素。将研究以下主题：现场调整的量子关键性：未筛选的近野杂质模型提供了现场的示例 - 调整量子临界点，具有费米温度，可以连续驱动到零。 我们将使用该模型的晶格概括为起点，我们将在其量子关键性的方法中对磁性重型电子系统的演变进行建模。填充的重型电子材料：我们将研究挫败感的相互作用和Hund偶联过渡金属中的近核效应的相互作用氧化物。隐形顺序和节点电荷密度波的形成：我们将研究两个频带系统，以开发一个在uru2si2中的隐藏顺序的理论。传播器，避免在常规方案中遇到的顶点校正困难。 这种新方法将应用于单个杂质和晶格围栏模型。伪制剂系统中的状态相关密度：受天体物理学的棕色扭转干涉测量的类比，我们将开发一种方法来提取信息顺序参数相关性，从在扫描隧道显微镜中测得的状态波动。%% %%该赠款支持对强相关的重型电子系统物理学的理论研究。 这项研究位于现代凝结物理物理学的最前沿，将为基本物理学的基础做出贡献。 研究生和博士后研究合伙人的参与将确保将子孙后代的理论家在这些重要领域进行培训。 像大多数凝结物理学一样，该研究也有可能影响新材料的开发和应用。***