"Impurities, Defects, and Interfaces in Bulk and Nanoscale Condensed Matter (Meta)Materials"

“块状和纳米级凝聚态（元）材料中的杂质、缺陷和界面”

• 批准号: 250045-2012
• 负责人: Chow, Kim
• 金额: $ 2.19万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=524904
• 关键词: Impurities; Defects; Interfaces; Bulk; Nanoscale

One main objective of my proposed research is to learn how "imperfections", ranging from impurities/defects to interfacial mismatch, can dramatically modify the electronic, magnetic, and optical properties of bulk and nanoscale (meta)materials. These studies are scientific interesting and also of considerable practical relevance since imperfections are inevitable and understanding them will enable us to use them to manipulate the behavior of the host for technological applications. Related to this, one subset of my proposed research is to study the depth-dependence of "interfacial phenomena", i.e. the evolution of properties near the surface of a material or in the vicinity of a buried interface. All electronic, magnetic and structural properties of a (meta)materials are altered near the interface between two materials. These changes can be confined to only a few nanometers near the interface, or the host properties can be changed over many micrometers. We plan to use some of the very few methods that can probe these phenomena as a function of depth, namely low energy beta-detected nuclear magnetic resonance and muon spin rotation/relaxation. In addition, part of my proposed research continues to investigate the local magnetism in systems with novel magnetic properties but for which the underlying mechanisms are not fully understood. Hence, our general goals are: (i) provide novel experimental information on how imperfections and interfaces control the properties of existing or new materials that are relevant for practical applications, and (ii) test theoretical predictions of interesting phenomena in materials where there is thus far no accepted understanding.

我拟议的研究的一个主要目的是学习从杂质/缺陷到界面不匹配的“缺陷”如何显着修改散装和纳米级（Meta）材料的电子，磁性和光学特性。这些研究很有趣，而且具有相当大的实际相关性，因为缺陷是不可避免的，并且理解它们将使我们能够使用它们来操纵宿主在技术应用中的行为。与此相关的是，我提出的研究的一个子集是研究“界面现象”的深度依赖性，即材料表面附近或埋藏界面附近的性质的演变。 A（meta）材料的所有电子，磁性和结构特性都在两种材料之间的界面附近发生变化。这些更改可以仅限于接口附近的几个纳米，也可以在许多微米上更改主机属性。我们计划使用一些可以探测这些现象作为深度的函数的方法中的一些方法，即低能β检测到的核磁共振和MUON自旋旋转/弛豫。此外，我提出的一部分研究继续研究具有新型磁性特性的系统中的局部磁性，但尚未完全了解基本机制。因此，我们的一般目标是：（i）提供有关缺陷和界面如何控制与实际应用相关的现有或新材料的特性的新型实验信息，以及（ii）在迄今为止尚无公认理解的材料中测试有趣现象的理论预测。