US-Switzerland Cooperative Research on Correlated Electron Systems

9414840 Mihaly该奖项支持Laszlo Mihaly教授和纽约州立大学石溪分校(SUNY)的研究生，以及布鲁克海文国家实验室的Gwyn Williams博士与瑞士洛桑联邦理工学院的Laszlo Forro教授在固态物理方面进行合作。他们将通过测量从远红外到可见光的光学电导率来探索选定的超导材料中的电子态。与会者为合作带来了研究薄膜红外传输特性的设备和专业知识的独特组合。特别是，EPFL的Forro博士开发了一种用于超薄单晶的特殊样品制备方法，可以对各种各向异性材料进行光学分析。他将研究样品的磁性和电子输运性质。大部分的光谱工作将在石溪进行，而低频红外测量将在布鲁克海文国家实验室的国家同步辐射光源进行。超导、自旋密度波和电荷密度波都是电子关联的表现形式。虽然对于这三种现象，电子之间的相互作用和电子基态的性质有很大的不同，但它们之间也有重要的相似之处。这项美国和瑞士的合作研究将对三种模型材料进行实验分析，每种材料都展示了其中一种现象，以提高对导致这些有趣和潜在有用现象的电子关联的理解。这一结果应该对在高温超导领域工作的凝聚态物理学家特别感兴趣。***

9414840 Mihaly This award supports Professor Laszlo Mihaly and a graduate student of the State University of New York (SUNY) at Stony Brook, joined by Dr. Gwyn Williams of Brookhaven National Laboratory, to collaborate in solid state physics with Professor Laszlo Forro of the Ecole Polytechnique Federale de Lausanne (EPFL), Switzerland. They will explore electron states in selected superconducting materials by measuring the optical conductivity from the far infrared to the visible range. The participants bring to the collaboration a unique combination of facilities and expertise for the study of the infrared transmission properties of thin crystalline films. In particular, Dr. Forro at EPFL has developed a special sample preparation method for extremely thin single crystals which permits optical analyses of a variety of anisotropic materials. He will investigate the magnetic and electronic transport properties of the samples. Most of the optical spectroscopy work will be carried out at Stony Brook, while low frequency infrared measurements will be made at the National Synchrotron Light source at Brookhaven National Laboratory. Superconductivity, spin density waves and charge density waves are all manifestations of electron correlations. While the interaction between the electrons and the nature of the electronic ground state are profoundly different for these three phenomena, there are also important similarities among them. This U.S.-Swiss collaborative research will experimentally analyze three model materials each of which exhibits one of these phenomena, in order to improve understanding of the electron correlations which cause these interesting and potentially useful phenomena. The results should be of particular interest to condensed matter physicists working in the area of high temperature superconductivity. ***