Collective Modes in Quantum Wires and Strongly Correlated Tunable Ferromagnets

9303568 Sooryakumar该项目将支持通过法布里-珀罗光学干涉测量法研究宽度与电子德布罗意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，它们的寿命和相邻横向导线之间的耦合，这对理解量子导线的电子特性至关重要。 此外，电子-电子相互作用的自旋波动力学和弹性稳定性的散装3D铁磁体的影响将通过光散射研究一组新的Fe 1-xCox外延层。 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，这是近年来出现的一种联系。 该项目将支持对下一代高速电子设备基础的几百分之一微米宽的超窄通道中的电荷载流子进行激光光谱研究。 该研究的重点是在个别通道内的载流子的集体响应，以及他们的耦合到相邻的横向导线。 此外，电荷载流子之间的相互作用的影响，目前最大的挑战之一，理解在金属材料的磁性，将得到解决。 这将通过光学光谱和改变电子相互作用的强度进行研究，这是最近在合金化不同的磁性元素方面取得的突破。 ***

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. ***