CAREER: Dynamics and Transport of Excited Strongly Correlated Many-Particle Systems

职业：受激强相关多粒子系统的动力学和输运

• 批准号: 0955714
• 负责人: Vadim Oganesyan
• 金额: $ 45万
• 依托单位: CUNY College of Staten Island
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-05-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0955714&HistoricalAwards=false
• 关键词: CAREER; Dynamics; Transport; Excited; Strongly

TECHNICAL SUMMARY This CAREER award supports computational and theoretical research, and education aimed at elucidating the emergence of macroscopic dissipative transport from inherently deterministic and usually quantum microscopic motion of interacting particles. Recent explorations of this fundamental question have been anchored by three phenomena: (i) the so called "bad metal" behavior in synthetic conductors, (ii) many-body localization, and (iii) equilibration of anharmonic oscillators in one dimension. While the first of these is well documented in many interesting materials, such as vanadium dioxide, Buckminsterfullerene, and high temperature superconductors, the latter two are primarily motivated by fundamental questions of many-body theory. The PI aims to propose clear ways to discern these often subtle phenomena in simple experiments. Rather than more common approaches that involve taking a limit of zero absolute temperature, the PI will focus on finite temperature approaches for which very precise numerical computations of dynamical properties are possible. Because phenomena of interest dominate asymptotic low frequency response at non-zero temperatures, calculation at finite temperature enables a convenient avenue for exploration. By most common approaches are not able to address hallmarks of correlated transport as violation of Mott-Ioffe-Regel limit and non-Drude optical response. Motivated by the particularly spectacular examples of correlated transport extending from low to very high temperatures, the PI will explore the idea that the high temperature regime may serve as the novel starting point for analyzing a broad range of experiments done at intermediate to low temperature, from bad metals to heavy fermions to apparent quantum critical points. This award supports educational opportunities for graduate and undergraduate students. The PI plans a diverse research group where students at different levels will be involved in mentoring, education and research experiences. The PI plans to teach an exploration-based course in cross-disciplinary computational research. The PI aims to help boost a public appreciation of materials research with a focus on exposing non-expert audiences to cutting edge research in an accessible form with the aim of effectively stimulating lifelong interest in learning. Outreach activities stemming from this CAREER award will also include colloquium-style public lectures about condensed matter physics and PI's own research. NONTECHNICAL SUMMARY This CAREER award supports computational and theoretical research, and education involving novel phenomena associated with electron motion in synthetic materials that conduct electricity, magnetic materials, and atomic motion in gases of atoms cooled near the absolute zero of temperature. The PI will develop theoretical and numerical methods to describe the motion of electrons in response to applied fields, for example an applied voltage. The PI seeks in part to understand the microscopic origins of dissipation that degrades electron motion. The PI takes a different approach than much of the previous research that has been done on this topic. The research more generally focuses on understanding the dynamical behavior of many electron or many atom systems in which the constituent electrons or atoms interact with each other, the systems are described by quantum mechanics, but the temperature may be high enough that the system is approaching the crossover to classical mechanics. Many electron systems such as these may appear in certain kinds of materials and in nanostructures under the right conditions.This award supports fundamental research that aims at our understanding of electronic properties of materials and the microscopic origins of how energy is lost in electronic motion. The results may lead to the discovery of new phenomena advancing fundamental science and may also lead to new technological applications.This award supports educational opportunities for graduate and undergraduate students. The PI plans a diverse research group where students at different levels will be involved in mentoring, education and research experiences. The PI plans to teach an exploration-based course in cross-disciplinary computational research. The PI aims to help boost a public appreciation of materials research with a focus on exposing non-expert audiences to cutting edge research in an accessible form with the aim of effectively stimulating lifelong interest in learning. Outreach activities stemming from this CAREER award will also include colloquium-style public lectures about condensed matter physics and PI?s own research.

技术摘要该职业奖支持计算和理论研究，以及旨在阐明从固有的确定性和通常的相互作用粒子的量子显微镜运动中阐明宏观耗散运输的教育。对这个基本问题的最新探索是由三个现象锚定的：（i）合成导体中所谓的“不良金属”行为，（ii）多体定位，以及（iii）在一个维度中对非谐振荡器的平衡。尽管其中的第一个在许多有趣的材料中有充分的文献记载，例如二氧化钒，Buckminsterfullerene和高温超导体，但后两个主要是由多体理论的基本问题激发的。 PI旨在提出清晰的方法，以简单的实验中辨别这些经常细微的现象。 PI不是更常见的方法，而不是涉及零绝对温度的限制，而是将重点放在有限温度方法上，而这些温度方法是可以对动态特性进行非常精确的数值计算的。因为感兴趣的现象在非零温度下占主导地位的渐近低频响应，所以在有限温度下的计算可以方便地进行探索。在大多数常见的方法中，由于违反了Mott-Ioffe-Regel限制和非干燥的光学响应，因此无法解决相关运输的标志。 PI是由从低温到高温延伸到非常高温的相关运输的特别示例的动机，将探讨高温状态可能是分析在中间到低温到低温（从不良金属到较重的费米）到较重的量子关键点的新型实验的新起点。该奖项支持研究生和本科生的教育机会。 PI计划了一个多样化的研究小组，其中不同级别的学生将参与指导，教育和研究经验。 PI计划在跨学科计算研究中教基于探索的课程。 PI的目的是帮助提高对材料研究的公众欣赏，重点是将非专业的受众以可访问的形式暴露于尖端研究，以有效刺激对学习的终身兴趣。源自该职业奖的外展活动还将包括座谈会风格的公共演讲，内容涉及凝聚态物理和PI自己的研究。非技术性摘要该职业奖支持计算和理论研究，以及涉及与电子运动相关的新现象的教育，这些现象是在合成材料中进行电力，磁性材料和原子运动在温度绝对零附近冷却的原子气体中。 PI将开发理论和数值方法来描述对应用磁场的响应，例如施加的电压。 PI在某种程度上寻求理解降解电子运动的耗散的微观起源。 PI采取的方法与对该主题进行的许多先前研究不同。 该研究通常集中于理解许多电子或许多原子系统的动力学行为，其中组成电子或原子相互相互作用，该系统由量子力学描述，但是温度可能足够高，以至于该系统将交叉接近古典力学。许多电子系统可能以某些材料和纳米结构出现在适当条件下的纳米结构中。该奖项支持我们对材料电子特性的理解以及电子运动中能量如何损失的微观起源的基础研究。结果可能会导致发现新现象发展的基本科学，并可能导致新的技术应用。该奖项为研究生和本科生提供了教育机会。 PI计划了一个多样化的研究小组，其中不同级别的学生将参与指导，教育和研究经验。 PI计划在跨学科计算研究中教基于探索的课程。 PI的目的是帮助提高对材料研究的公众欣赏，重点是将非专业的受众以可访问的形式暴露于尖端研究，以有效刺激对学习的终身兴趣。源自该职业奖的外展活动还将包括座谈会风格的公共演讲，内容涉及有关凝聚态物理学和PI自己的研究。