Collective Modes in Quantum Wires and Strongly Correlated Tunable Ferromagnets

该项目将支持通过Fabry-Perot光学干涉测量法研究宽度与电子de-Broglie波长相当的窄通道中的载流子。它将允许确定等离子体色散，它们的寿命和相邻侧线之间的耦合，这对理解量子线的电子特性至关重要。此外，电子-电子相互作用对块体三维铁磁体自旋波动力学和弹性稳定性的影响将通过一组新型Fe1-xCox涂层的光散射研究来研究。这将为电子相关性和弹性稳定性之间的相互作用提供重要数据，这是近年来浮出水面的一种联系。该项目将支持对超窄通道中载流子的激光光谱研究，该通道的宽度为百分之几微米，是下一代高速电子设备的基础。该研究的重点是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，将讨论载流子之间相互作用的影响，这是理解金属材料磁性的最大挑战之一。这将通过光谱学和改变电子相互作用的强度来研究，这是由于最近在合金不同磁性元素方面的突破而成为可能的。＊＊＊

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. ***