Theoretical Investigations of Surface Effects in Solids, Anharmonic Properties of Crystals and Surfaces, and Properties of Semiconductors

固体表面效应、晶体和表面的非调和性质以及半导体性质的理论研究

基本信息

批准号：
8815866
负责人：
Alexei Maradudin
金额：
$ 5.5万
依托单位：
University of California-Irvine
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1989
资助国家：
美国
起止时间：
1989-02-01 至 1990-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8815866&HistoricalAwards=false
关键词：
Theoretical Investigations Surface Effects Solids

项目摘要

A research program in theoretical condensed matter physics which will increase our knowledge and understanding of surface physics, the anharmonic properties of crystals and surfaces, and the properties of semiconductors is planned. The study of surface physics will include theoretical determinations of the dispersion curves for surface phonons on low index surfaces of metals, the amplification of surface polaritons, the propagation of surface polaritons in superlattices layered parallel or perpendicular to the free surface of the sample, and the properties of localized interface and impurity states in quasicrystals. Computer simulation studies of the anharmonic properties of crystals and surfaces will provide results for thermodynamic properties and excitation lifetimes that are correct to all orders in the anharmonicity. Phonon transport phenomena in dielectric crystals, such as phonon viscosity, thermal conductivity, and ultrasonic attenuation, will be studied on the basis of numerical solutions of the linearized Peierls Boltzmann equation for realistic crystal models. The linewidths of surface phonons due to lattice anharmonicity will also be investigated. A theoretical effort will be made on the excitations and statistical mechanics of bounded nonlinear media. Theoretical investigations into the properties of semiconductors will focus on the lifetimes of excited impurity states and the effects of electron-phonon interaction on impurity states in silicon inversion layers. Localized electronic states in compensated semiconductors will also be studied.

一项理论凝结物理学的研究计划，将计划提高我们对表面物理学的知识和理解，晶体和表面的非谐属性以及半导体的特性。表面物理学的研究将包括理论上确定金属低索引表面上表面声子的分散曲线，表面偏振子的扩增，超级层状中表面极性子在超级晶格中的繁殖，平行或垂直于样品的自由表面，以及样品的自由表面，以及准晶体中局部界面和杂质状态的特性。对晶体和表面的非谐波特性的计算机仿真研究将为热力学特性和激发寿命提供结果，这些寿命对非谐波中的所有订单都是正确的。介电晶体中的声子传输现象将根据逼真的晶体模型的线性化PEIERLS Boltzmann方程的数值解决方案进行研究。还将研究由于晶格非谐度引起的表面声子的线宽。关于有限的非线性媒体的激发和统计力学，将做出理论上的努力。对半导体特性的理论研究将集中于激发杂质状态的寿命以及电子 - phonon相互作用对硅反转层中杂质状态的影响。还将研究补偿半导体中的局部电子状态。