Spectral Persistence and the Anharmonic Dynamics of Solids

固体的光谱余辉和非简动力学

• 批准号: 9631298
• 负责人: Albert Sievers
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-12-15 至 2000-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9631298&HistoricalAwards=false
• 关键词: Spectral; Persistence; Anharmonic; Dynamics; Solids

9631298 Sievers Technical Abstract The proposal experimental study focuses on identifying the static and dynamic properties of multiple elastic configurations in crystals and glasses. The method is to examine the energy transport between the low lying equilibrium and non-equilibrium states and configurations of solids with a variety of linear and nonlinear spectroscopic tools, including persistent IR spectral hole burning, IR pump-probe transient hole burning, Raman scattering and fourier transform IR spectroscopy. Interest has grown in the possibility that intrinsic localized modes, made possible by the lattice anharmonicity, may exist in bulk crystals, at their surfaces or at their edges. The progress in localized vibrational mode studies is leading to the exploration of intrinsic localized excitations in other nonlinear dynamical systems. Antiferromagnetic crystals provide new experimental opportunities to search for intrinsic localized excitations. %%% Non-Technical Abstract An outstanding problem in condensed matter physics is identifying the source of the static and dynamic behavior of near-equilibrium vibrational states in crystals and glasses. The proposed method is to examine the energy transport between the low lying equilibrium and non- equilibrium configurations of solids with a variety of spectroscopic tools. Recently, interest has grown in the likelihood of a new type of localized vibrational excitation made possible by the lattice nonlinearity that may exist in bulk crystals, at their surfaces or at their edges. Progress here is leading to the exploration of intrinsic localized excitations in nonlinear magnetic systems. The proposed measurements should impact on topics as diverse as the role of structural defects in optical materials used for information storage, amplification and optical transmission, and on the science and technology of fast-ion conductors and that of magnetic structures. ***

小行星9631298 技术摘要该提案的实验研究重点是确定晶体和玻璃中多种弹性结构的静态和动态特性。 该方法是用各种线性和非线性光谱工具，包括持续红外光谱烧孔，红外泵浦-探测瞬态烧孔，拉曼散射和傅立叶变换红外光谱，研究固体的低平衡态和非平衡态之间的能量输运。 人们越来越感兴趣的可能性，内在的本地化模式，使可能的晶格非谐性，可能存在于散装晶体，在其表面或在其边缘。 局域振动模式研究的进展，导致探索在其他非线性动力学系统的内在局域激发。 反铁磁晶体 提供 新 寻找内在局部激发的实验机会。 %%%非技术摘要凝聚态物理学中一个突出的问题是确定源 晶体和玻璃中近平衡振动态的静态和动态行为。 所提出的方法是用各种光谱工具来研究固体低位平衡和非平衡构型之间的能量输运。 最近，兴趣已经增长的可能性，一种新的类型的本地化的振动激发可能存在于散装晶体，在其表面或在其边缘的晶格非线性。 这方面的进展导致了对非线性磁系统内禀局域激发的探索。 拟议的测量应影响到各种各样的主题，如用于信息存储，放大和光传输的光学材料中的结构缺陷的作用，以及快离子导体和磁结构的科学和技术。 ***