Theoretical Investigations of Anharmonic Properties of Crystals and Surface Effects in Solids

晶体非谐性质和固体表面效应的理论研究

• 批准号: 8918184
• 负责人: Richard Wallis
• 金额: $ 16.26万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-05-01 至 1993-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8918184&HistoricalAwards=false
• 关键词: Theoretical; Investigations; Anharmonic; Properties; Crystals

Research will be conducted in theoretical condensed matter physics to increase the knowledge and understanding of the anharmonic properties of crystals and of surface effects in solids. Computer simulation studies of the anharmonic properties of crystals 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 study of surface effects in solids will include nonperturbative self-consistent calculations of surface phonon dispersion curves for low index surfaces of metals and the amplification of surface plasmon polaritons. The linewidths of surface phonons due to lattice anharmonicity will also be investigated.

研究将在理论凝聚态物质中进行 物理学，以增加知识和理解的 晶体的非谐性质和表面效应 固体 非谐性质的计算机模拟研究 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 固体表面效应的研究 将包括非微扰自洽计算 金属低折射率表面声子色散曲线 以及表面等离子体激元的放大。 的 由于晶格非谐性引起的表面声子的线宽将 也被调查。