Microwave spectroscopy of unconventional metals, superconductors and insulators

非常规金属、超导体和绝缘体的微波光谱

• 批准号: 261622-2013
• 负责人: Broun, David
• 金额: $ 2.99万
• 依托单位: Simon Fraser University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=594615
• 关键词: Microwave; spectroscopy; unconventional; metals; superconductors

Society is currently reaping the benefits of the revolution in semiconductor electronics that occurred after the quantum behaviour of noninteracting electrons was understood in the early 20th century. It is the hope of many researchers around the world that there will be a second revolution in electronic materials when we understand a far more difficult quantum problem - the behaviour of systems of strongly interacting electrons. At this stage the challenges are fundamental: to understand how the important electronic properties emerge in systems of interacting electrons, and to harness these materials so that they produce the desired properties in a controlled way. Many of these materials display unusual forms of superconductivity, a state of matter in which all electrical resistance vanishes. Examples include the cuprate high temperature superconductors; the so-called "heavy fermion" materials, in which electrons appear to be 100 to 1000 times heavier than normal; and the recently discovered iron-based superconductors. At present, the mechanism responsible for superconductivity is not well understood in any of these materials. In addition, the nonsuperconducting states are unusual metals that pose some of the greatest challenges to our understanding of electrons in solids.

20 世纪初，人们了解了非相互作用电子的量子行为之后，社会目前正在享受半导体电子革命带来的好处。世界各地许多研究人员希望，当我们了解一个更加困难的量子问题——强相互作用电子系统的行为时，电子材料将会发生第二次革命。在这个阶段，挑战是根本性的：了解重要的电子特性如何在相互作用的电子系统中出现，并利用这些材料，使它们以受控的方式产生所需的特性。其中许多材料表现出不寻常的超导性，这是一种所有电阻都消失的物质状态。例子包括铜酸盐高温超导体；所谓的“重费米子”材料，其中电子似乎比正常材料重 100 至 1000 倍；以及最近发现的铁基超导体。目前，这些材料的超导机制尚不清楚。此外，非超导态是不寻常的金属，对我们理解固体中的电子提出了一些最大的挑战。