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

该奖项将支持加州大学伯克利分校的Peter Yu博士和法国格勒诺布尔国家卫生服务中心的Gerald Martinez博士之间的合作研究。该项目的目的是研究高压下半导体和超导体的性质。压力是材料的基本特性，可以用来改变固体的晶体结构。在这个项目中，研究人员将扩展早期的工作，利用压力来了解DX中心的性质，DX中心是GaAs和GaA1As合金中一个技术和科学上有趣的深层中心。压力将用于制造新的半导体/金属和超导体/超导超晶格。将开发新的技术来测量样品在高压下金刚石砧细胞内的磁化率。这次合作将利用伯克利在从头算伪势带结构计算和高压电学和光学测量领域的专业知识。与伯克利集团互补的是格勒诺布尔独特的高磁场磁铁设施。此外，马丁内斯博士还获得了新颖的SSL结构，例如在法国生长的短周期GaAs/A1As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.