Impurities and defects in condensed matter systems

凝聚态系统中的杂质和缺陷是有趣和重要的。除了与这些中心相关的令人着迷的基本物理现象外，许多此类材料(特别是半导体)中仅有少量杂质/缺陷的行为决定了它们在实际应用中的最终用途，因为它们极大地改变了主体的光学和/或电学性质。我的主要研究活动之一是阐明块状和纳米级半导体、绝缘体和金属中孤立杂质的局部结构、扩散系数、相互作用和反应。此外，我有意将其中一些杂质引入材料中，可以用作它们所在材料中磁性的微观探针。事实上，我的另一项研究活动是对几种有趣的磁性系统的研究和近表面结构相变的研究。此外，我还研究了相关电子系统中缺陷诱导现象的技术含义，如巨磁电阻材料和高温超导体。

Impurities and defects in condensed matter systems are interesting and important. In addition to the fascinating fundamental physics phenomena associated with these centers, the behavior of only a minute amount of impurities/defects inside many such materials (especially semiconductors) determines their eventual usefulness in practical applications since they dramatically modify the optical and/or electrical properties of the host. One of my primary research activities is the elucidation of the local structure, diffusitivities, interactions, and reactions of isolated impurities in bulk and nano-scale semiconductors, insulators, and metals. Furthermore, some of these impurities, which I intentionally introduce into the materials, can be used as microscopic probes of the magnetism in the material where they reside. In fact, another of my research activities is the investigation of several types of interesting magnetic systems and the study of near surface structural phase transitions. Moreover, I also study the technological implications of defect-induced phenomena in correlated electronic systems such as colossal magnetoresistance materials and high temperature superconductors.