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.

计划开展理论凝聚态物理研究项目，该项目将增加我们对表面物理、晶体和表面的非调和性质以及半导体性质的知识和理解。表面物理学的研究将包括低折射率金属表面上表面声子色散曲线的理论确定、表面极化子的放大、平行于或垂直于样品自由表面分层的超晶格中表面极化子的传播以及准晶中局域界面和杂质态的性质。对晶体和表面的非谐特性的计算机模拟研究将提供热力学特性和激发寿命的结果，这些结果对于非谐性的所有阶次都是正确的。将基于实际晶体模型的线性化 Peierls Boltzmann 方程的数值解来研究介电晶体中的声子输运现象，例如声子粘度、热导率和超声波衰减。还将研究由晶格非谐性引起的表面声子的线宽。将对有界非线性介质的激励和统计力学进行理论研究。对半导体特性的理论研究将集中在激发杂质态的寿命以及电子-声子相互作用对硅反型层中杂质态的影响。补偿半导体中的局域电子态也将被研究。