Local Moment and Heavy Fermion Physics

9312138 Coleman这个建议涉及重费米子物理。将考虑四个项目：1)发展重费米子超导的奇频配对模型。2)铀重费米子化合物中四极基态重偶态的关键测试。3)用Anderson晶格模型计算近藤绝缘子的光学电导率和动态磁化率。4)建立了URu2Si2中隐藏流动顺序的各向异性自旋配对理论。这个建议是关于电子的行为，在材料中的传输方面，电子的行为就好像它们有很大的质量。这一领域有着丰富的历史，但最近的发现突出了我们目前认识的根本困难。例如，两种新发现的重费米子材料——UPd2Al3和UNi2Al3——具有较大的磁矩，并且在相同的磁自由度下表现出超导性。这就给目前关于这类材料的理论带来了问题。此外，最近在重费米子物质URu2Si2的比热等性质中观察到的异常表明，在该系统的理论描述中存在一个“隐藏”变量。这样的工作是在什么被认为是最先进的当代凝聚态理论的最前沿。＊＊＊

9312138 Coleman This proposal concerns heavy Fermion physics. Four projects will be considered: 1) Development of an odd frequency pairing model for heavy Fermion superconductivity. 2) A critical test for quadrupolar ground-state doublets in uranium heavy Fermion compounds. 3) Computation of the optical conductivity and dynamic susceptibility of Kondo insulators within an Anderson lattice model. 4) Development of a theory for anisotropic spin pairing to model the hidden itinerant order in URu2Si2. %%% This proposal is concerned with the behavior of electrons which behave, with regards to their transport in a material, as if they have large masses. This field has a rich history but recent discoveries have highlighted fundamental difficulties in our present understanding. For example, two newly discovered heavy Fermion materials - UPd2Al3 and UNi2Al3 - have large magnetic moments and exhibit superconductivity from the same magnetic degrees of freedom. This causes problems for the present theory of such materials. Also, recent anomalies observed in such properties as the specific heat in the heavy fermion material URu2Si2 suggest that there is a "hidden" variable in the theoretical description of the system. Work such as this is at the forefront of what is considered state-of-the-art in contemporary condensed matter theory. ***