Theory of Interacting Fermi Systems

相互作用费米系统理论-该项目的目标是获得对电子-电子相互作用及其在固体中的表现的更深层次的理解。实现这一目标的一种方法将是研究已经发现的表现出意想不到的异常行为的物理性质，例如，可以归因于由电子-电子相互作用引起的对称性破坏的现象。提出的具体研究课题包括极低温下K中的纵向霍尔效应，碱金属中的紫外光学异常，反铁磁超导体中的两个磁振子交换，锌、镉和techum中的声子异常（可能与自旋密度波有关），“光学糖蜜”中的分数结晶，以及简单金属的垂直场回旋共振传输。固体中电子行为的最佳模型描述是基于电子几乎彼此独立的图像。尽管这种观点相当成功，但仍有大量重要现象不能用这种方法来适当地解释。当电子-电子相互作用变得重要时，必须发展新的理论描述。这个项目的目的是为实验中出现的一系列现象发展这样的描述，这些现象似乎明确地依赖于电子-电子相互作用。

Theory of Interacting Fermi Systems - The objective of the project is to acquire a deeper understanding of electron-electron interactions and their manifestations in solids. One approach toward this goal will be the study of physical properties which have been found to exhibit unexpected anomalous behavior, e.g., phenomena which can be attributed to broken symmetries caused by electron-electron interactions. Specific topics proposed for study include the longitudinal Hall effect in K at very low temperatures, ultraviolet optical anomalies in alkali metals, two magnon exchange in antiferromagnetic superconductors, phonon anomalies (possibly related to spin density waves) in zinc, cadmium, and technetium, fractional crystallization in 'optical molasses', and perpendicular-field cyclotron-resonance transmission in simple metals. %%% The best-established model descriptions for the behavior of electrons in solids are based on a picture where electrons are nearly independent of each other. Although such a viewpoint is quite successful, there are nevertheless a large number of important phenomena which cannot be explained properly by this approach. When electron-electron interactions become important, new theoretical descriptions must be developed. This project is aimed at developing such descriptions for a range of phenomena which appear experimentally and appear to depend explicitly on electron-electron interactions.