U.S.-Austria Cooperative Research: High Frequency Dynamics of Charge Density Waves (Materials Research)

该奖项将支持加州大学洛杉矶分校物理系George Gruner教授和奥地利维也纳大学固态物理研究所Karlheinz Seeger教授以及维也纳路德维希·玻尔兹曼固体物理研究所之间为期两年的固态物理合作研究项目。科学家和他们的研究小组成员将研究某些无机材料的导电性，这些材料表现出所谓的电荷密度波输运现象。微波谐波混合和微波整流实验将在各种频率值和广泛的温度和电场值范围内进行。目的之一是区分哪些现象可以根据经典描述来理解，哪些现象必须用量子方法来理解。在这项研究中研究的模型化合物将由加州大学洛杉矶分校的格鲁纳教授和他的研究小组制备。微波测量将在维也纳进行，西格尔教授的团队在那里开创了微波谐波混合技术。这些结果，当与加州大学洛杉矶分校的相关测量结果相结合时，应该有助于更好地理解电荷密度波输运现象。在这项合作努力中进行的基础研究预计将重要地增加我们对固体中电子相互作用的理解。这反过来可能最终导致新的电子材料和设备的设计。在这项研究中使用的奥地利微波技术也将由格鲁纳教授和他的小组应用于他们实验室正在调查的其他研究问题。

This award will support a two-year cooperative research project in solid state physics between Professor George Gruner, Department of Physics, University of California, Los Angeles (UCLA), and Professor Karlheinz Seeger, Institute for Solid State Physics, University of Vienna, Austria, and the Ludwig Boltzmann Institute for Solid State Physics, also in Vienna. The scientists and members of their research groups will study electrical conductivity properties of certain inorganic materials which show so-called charge density wave transport phenomena. Microwave harmonic mixing and microwave rectification experiments will be performed at various frequency values and over a broad range of temperatures and electric field values. One aim is to distinguish between phenomena which can be understood on the basis of classical descriptions and those for which a quantum approach is necessary. The model compounds to be studied in this research will be prepared by Professor Gruner and his research group at UCLA. The microwave measurements will be performed in Vienna, where Professor Seeger's group pioneered the technique of microwave harmonic mixing. These results, when combined with those from related measurements made at UCLA, should contribute significantly to a better understanding of the charge density wave transport phenomenon. The fundamental studies to be carried out in this cooperative effort are expected to add importantly to our understanding of electron interactions in solids. This in turn could lead eventually to the design of new electronic materials and devices. The Austrian microwave techniques to be employed in this research will also be applied by Professor Gruner and his group to other research problems under investigation in their laboratory.