Optical Dephasing of Ions in Solids and Studies of Phonon Dynamics

固体中离子的光学相移和声子动力学研究

• 批准号: 9015468
• 负责人: Richard Meltzer
• 金额: $ 18.8万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-15 至 1995-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9015468&HistoricalAwards=false
• 关键词: Optical; Dephasing; Ions; Solids; Studies

This research has the purpose of obtaining new information on the dynamics of high frequency phonons using powerful far infrared phonon generation techniques coupled with sensitive and tunable optical detection methods. A second project involves the study of optical dephasing and spectral diffusion using a variety of techniques probing a wide range of time scales. Far infrared defect-induced one-phonon absorption permits generation of a tunable monoenergetic phonon distribution, which when combined with tunable detection employing vibronic sideband phonon spectroscopy, will permit truly time-resolved phonon spectroscopy. This spectroscopy will be used to study anharmonic phonon-phonon interactions responsible for phonon breakup and phonon recombination. The optical dephasing studies will utilize methods in both the time and frequency domain. Of special interest are the effects of different time scales for the determination of homogeneous line width. These results will be analyzed with stochastic models for the dephasing due to electron spin-spin and electron-nuclear spin interactions. Computer simulations will also be developed.

这项研究的目的是使用强大的远红外声子生成技术以及敏感且可调的光学检测方法获得有关高频声子动态的新信息。 第二个项目涉及使用各种探测各种时间尺度的技术研究光学脱位和光谱扩散。 远红外缺陷诱导的单音吸收允许生成可调的单声子分布，当它与使用振动侧带声子光谱的可调节检测结合使用时，它将允许真正分辨时间分辨的声子光谱。 该光谱法将用于研究负责声子分解和声子重组的Anharmonic Phonon-phonon相互作用。 光学研究研究将在时间和频域中使用方法。 特别感兴趣的是不同时间尺度对确定均匀线宽度的影响。 这些结果将通过电子自旋旋转和电子核自旋相互作用引起的随机模型进行分析。 计算机模拟也将开发。