Collective Modes in Quantum Wires and Strongly Correlated Tunable Ferromagnets

量子线和强相关可调谐铁磁体中的集体模式

• 批准号: 9303568
• 负责人: Ratnasingham Sooryakumar
• 金额: --
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1997-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9303568&HistoricalAwards=false
• 关键词: Collective; Modes; Quantum; Wires; Strongly

9303568 Sooryakumar This project will support the study of carriers in narrow channels of widths comparable to the electron de-Broglie wavelength through Fabry-Perot optical interferometry methods. It will allow for the determination of the plasmon dispersion, their lifetimes and coupling between neighboring lateral wires that are vital to an understanding of the electronic properties of quantum wires. In addition, the effects of electron-electron interactions on the spin wave dynamics and elastic stability of bulk 3d ferromagnets will be investigated through light scattering studies on a novel set of Fe1-xCox epilayers. This will provide important data on the interplay between electron correlations and elastic stability, a connection that has surfaced in recent year. %%% This project will support a laser spectroscopic study of charge carriers in ultra-narrow channels a few hundredths of a micron wide that underlie the next generation of high speed electronic devices. The study focusses on the collective response of carriers within individual channels as well as their coupling to neighboring lateral wires. In addition, the effects ofinteractions between charge carriers, that present one of the greatest challenges to understanding magnetism in metallic materials, will be addressed. This will be investigated through optical spectroscopy and varying the strength of the electron interactions made possible by a recent breakthrough in alloying different magnetic elements. ***

9303568 Sooryakumar该项目将通过法布里-珀罗光学干涉术支持对宽度与电子德布罗意波长相当的窄通道中载流子的研究。它将允许确定等离子体激元的色散、它们的寿命以及相邻侧线之间的耦合，这对理解量子线的电子性质至关重要。此外，还将通过对一组新的Fe1-xCOX外延层的光散射研究电子-电子相互作用对块体3D铁磁体的自旋波动力学和弹性稳定性的影响。这将为电子关联和弹性稳定性之间的相互作用提供重要数据，弹性稳定性是近年来出现的一种联系。%该项目将支持对作为下一代高速电子设备基础的几个微米宽的超窄通道中的电荷载流子的激光光谱研究。这项研究集中在单个通道内载波的集体响应以及它们与相邻侧线的耦合。此外，还将讨论载流子之间的相互作用的影响，这是理解金属材料中磁性的最大挑战之一。这将通过光学光谱学和改变电子相互作用的强度来研究，这是最近在合金化不同磁性元素方面取得的突破。***