US-France Cooperative Research: Properties of Semi- conductors, Superlattices and Superconductors under High Pressure

该奖项将支持Peter Yu博士， 加州大学伯克利分校和杰拉尔德·马丁内斯博士， 法国格勒诺布尔，国家服务中心。 的 该项目的目的是研究半导体的性质， 高压下的导体和超导体。 压力是材料的基本属性，可以 用来改变固体的晶体结构。 在这 项目，调查人员将扩大早期的工作， 压力，以了解DX中心的属性，这是一个 GaAs中技术和科学上有趣的深中心 GaAlAs合金。 压力将用于制造新的 半导体/金属和超导体/超导体超晶格。 将开发新技术来测量磁化率 在金刚石压砧单元内的高压下对样品进行测试。 此次合作将利用 Berkeley在从头算赝势能带结构方面的研究 计算和高压电气和光学测量- 的部分。 补充伯克利集团是独特的高场 格勒诺布尔的磁铁工厂 此外，Martinez博士 获得新的SSL结构，例如短周期GaAs/A1 As 法国生长的超晶格。

This award will support collaborative research between Dr. Peter Yu, University of California at Berkeley, and Dr. Gerald Martinez, Service National des Champs Intenses, Grenoble, France. The objective of the project is to study the properties of semi- conductors and superconductors under high pressure. Pressure is a fundamental property of materials and can be utilized to alter the crystal structure of solids. In this project, the investigators will extend earlier work in using pressure to understand the properties of the DX center, which is a technological and scientifically interesting deep center in GaAs and GaA1As alloys. Pressure will be used to fabricate new semiconductor/metal and superconductor/superconductor superlattices. New techniques will be developed to measure magnetic susceptibility of samples under high pressure inside the diamond anvil cell. This collaboration will take advantage of the expertise at Berkeley in the areas of ab initio pseudopotential band structure calculations and in high pressure electrical and optical measure- ments. Complementing the Berkeley group are the unique high field magnet facilities in Grenoble. In addition, Dr. Martinez has access to novel SSL structures, such as short period GaAs/A1As superlattices grown in France.