Correlated Quantum and Classical Systems; Dense Light Elements and Their Combinations

相关的量子和经典系统；

• 批准号: 0302347
• 负责人: Neil Ashcroft
• 金额: $ 45.9万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-06-01 至 2006-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0302347&HistoricalAwards=false
• 关键词: Correlated; Quantum; Classical; Systems; Dense

This grant supports theoretical studies of the light elements, including hydrogen and also the light elements in combination, but placed under conditions of high pressure and also of elevated temperature. The research also includes studies of correlated quantum and classical systems under similar conditions, but with particular emphasis on possible novel states of order. One topic of growing prominence in such systems is the fundamental and increasingly pragmatic area of superconductivity, impelled by the recent and quite dramatic discovery of superconductivity occurring in compressed lithium with a transition temperature of about 20K at 48Gpa, which if substantiated would be the highest of any element. Previous studies had shown that these so-called simple elements could adopt structures of considerable complexity at similar conditions. Further, these elements were observed to take up structures exhibiting incommensurabilities. And it is surely remarkable that the light elements in the straightforward combination MgB2 have such a dramatic effect on the field of superconductivity.%%%These theoretical studies will investigate the electronic properties of the light elements, e.g., hydrogen, lithium, etc., under high pressure and high temperatures. These so-called simple elements yield unexpected rich structures including superconductivity. While the research is very basic, the results will be very beneficial in understanding superconductivity which has many potential applications. The project will support graduate students.***

这笔赠款支持轻元素的理论研究，包括氢和轻元素的组合，但置于高压和高温条件下。这项研究还包括在类似条件下对关联量子系统和经典系统的研究，但特别强调可能的新有序状态。在这样的系统中，一个日益突出的话题是超导电性的基本领域和日益实用的领域，最近相当戏剧性地发现，在48 Gpa时转变温度约为20K的压缩锂中存在超导电性，如果得到证实，这将是所有元素中最高的。以前的研究表明，在类似的条件下，这些所谓的简单元素可以采用相当复杂的结构。此外，观察到这些元素采用了表现出不可公度的结构。这些理论研究将研究轻元素如氢、锂等在高温高压下的电子性质。这些所谓的简单元素产生了意想不到的丰富结构，包括超导。虽然这项研究是非常基础的，但其结果将对理解超导这一具有许多潜在应用的问题非常有益。该项目将支持研究生。*