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

一个理论凝聚态物理学的研究项目， 将增加我们对表面物理学的知识和理解， 晶体和表面的非谐性质， 半导体的特性被规划。 表面的研究 物理学将包括色散的理论测定 金属低折射率表面上的表面声子曲线， 表面极化激元的放大，表面极化激元的传播 超晶格中的极化激元平行或垂直于 样品的自由表面，以及局部化的性质 准晶体中的界面态和杂质态。 计算机 晶体非谐特性的模拟研究， 表面将提供热力学性质的结果， 激励寿命是正确的所有订单中， 非谐性 电介质中的声子输运现象 晶体，如声子粘度，热导率， 超声衰减，将研究的基础上，数值 线性化Peierls Boltzmann方程的解， 逼真的水晶模型 表面声子的线宽 晶格非谐性也将被研究。 一 理论上的努力将作出的激励和 有界非线性介质的统计力学 理论 对半导体性质的研究将集中于 对激发杂质态寿命的影响 硅中杂质态的电子-声子相互作用 逆温层 补偿电子局域态 还将研究半导体。

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.