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. ***

9631298 SIEVER技术摘要建议实验研究重点是识别晶体和玻璃中多种弹性构型的静态和动态特性。 该方法是检查具有各种线性和非线性光谱工具，包括持续的IR频谱燃烧，IR泵送瞬态孔燃烧，拉曼散射和拉曼散射，以及傅立叶转化红外光谱。 兴趣的增长可能是由于晶格非谐度使固有的局部模式可能存在于散装晶体，表面或边缘的散装晶体中。 局部振动模式研究中的进展是导致探索其他非线性动力学系统中固有的局部激发。 抗铁磁晶体为寻找内在的局部激发提供了新的实验机会。 %% %%非技术抽象物理学中的一个杰出问题是识别晶体和玻璃中近平衡振动状态的静态和动态行为的来源。 提出的方法是检查使用各种光谱工具的固体的低谎言平衡和非平衡构型之间的能量传输。 最近，兴趣是由于新型局部振动激发的可能性增长，这是由于散装晶体，其表面或边缘可能存在的晶格非线性而产生的。 这里的进展导致探索非线性磁系统中固有的局部激发。 所提出的测量应影响与结构缺陷在用于信息存储，放大和光传输的光学材料中的作用，以及快速离子导体和磁性结构的科学和技术的作用。 ***