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.

这项研究的目的是利用强大的远红外声子产生技术与灵敏且可调谐的光学检测方法相结合，获得有关高频声子动力学的新信息。 第二个项目涉及使用各种技术探测广泛的时间尺度来研究光学相移和光谱扩散。 远红外缺陷引起的单声子吸收允许产生可调谐单能声子分布，当与采用电子振动边带声子光谱的可调谐检测相结合时，将允许真正的时间分辨声子光谱。 该光谱将用于研究导致声子分裂和声子复合的非谐波声子-声子相互作用。 光学相移研究将利用时域和频域的方法。 特别令人感兴趣的是不同时间尺度对于确定均匀线宽的影响。 这些结果将通过电子自旋-自旋和电子-核自旋相互作用引起的失相的随机模型进行分析。 计算机模拟也将得到开发。