Transverse Phenomena in Ensembles of Multistate Fermions

多态费米子系综中的横向现象

• 批准号: 9100197
• 负责人: Alexander Meyerovich
• 金额: $ 13.9万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-01 至 1995-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9100197&HistoricalAwards=false
• 关键词: Transverse; Phenomena; Ensembles; Multistate; Fermions

The research on this new grant will focus on transverse phenomena in ensembles of multistate fermion systems. One theoretical objective is to bridge the gap between the new, actively developing field of spin-polarized quantum systems and conventional theories of low temperature systems of particles with internal degrees of freedom. Another objective is to develop a general theory of transverse (off-diagonal in internal states) phenomena in systems of multistate fermions. The Fermi liquid theory fails to describe this class of effects and needs, at the minimum, to be modified. There will be strong interactions with various experimental groups in order to apply the developed theories to ultralow-temperature thermometry, boundary effects and new quantum coherent effects in ultra-cold atomic ensembles and beams, and some quasi-particle systems in solids. %%% Fermi liquid theory has been the standard model for many years of the collective properties of interacting fermions at low temperatures. However, recent work on spin-polarized systems at ultra-low temperatures has indicated that the Fermi liquid model is deficient at these extreme conditions. This research will modify the Fermi liquid model, or develop new models as necessary, to deal with these new phenomena.

这项新资助的研究将集中于多态费米子系统系综中的横向现象。 一个理论目标是弥合新的、积极发展的自旋极化量子系统领域与具有内部自由度的粒子低温系统的传统理论之间的差距。 另一个目标是发展多态费米子系统中横向（内态非对角）现象的一般理论。 费米液体理论无法描述此类效应，至少需要修改。 为了将所发展的理论应用于超低温测温、超冷原子系综和光束中的边界效应和新的量子相干效应以及固体中的一些准粒子系统，将与各个实验组进行强有力的相互作用。 %%% 费米液体理论多年来一直是低温下相互作用的费米子集体特性的标准模型。 然而，最近对超低温下自旋极化系统的研究表明，费米液体模型在这些极端条件下是有缺陷的。 这项研究将修改费米液体模型，或根据需要开发新模型，以应对这些新现象。