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Bath-Induced and Long-Range Interactions in Disordered Strongly Correlated Optical Lattices

无序强相关光学晶格中的浴诱导和长程相互作用

基本信息

批准号：
1806307
负责人：
Brian DeMarco
金额：
$ 48万
依托单位：
University of Illinois at Urbana-Champaign
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806307&HistoricalAwards=false
关键词：
Bath Induced Long Range Interactions

项目摘要

Disorder, inescapable in nature, can strongly affect the behavior of materials underpinning modern technologies. An urgent problem confronting physics is understanding the interplay of disorder and strong inter-particle interactions in quantum materials. Strong interactions are an ingredient crucial to remarkable phenomena such as high-temperature superconductivity. How interactions and disorder compete or cooperate in these materials to affect superconductivity and give rise to new quantum states is not fully understood. Ultracold atoms trapped in an optical lattice, which is a crystal formed from light, will be used as a model system to study this critical problem. Controllable and completely characterized disorder will be introduced by superimposing optical speckle, which is a laser beam consisting of randomly distributed bright and dark regions. The emergence of different quantum states as the disorder and interactions are independently tuned will be measured. Knowledge gained from this system may lead to a better understanding of high-temperature superconductors and techniques for mitigating the impact of disorder on their performance. The next generation of engineers and scientists will be trained on cutting-edge technologies in laser science, high-frequency microwave electronics, and high-speed computer-controlled signaling.This project builds on previous lattice experiments that discovered a disorder-induced bosonic insulator using Rb-87 atoms and observed a disorder-induced metal-insulator transition using K-40 atoms. Two projects designed to resolve outstanding questions regarding the interplay of strong interactions and disorder in three dimensions will be pursued. First, the impact of a bath on disorder-localized states will be measured using a mixture of Rb-87 hyperfine components trapped in a spin-dependent lattice. Second, the influence of long-range interactions on quantum localization will be investigated using Rydberg dressing of K-40 atoms trapped in a disordered optical lattice. These studies will advance the state-of-the-art in disordered quantum gases, thus enabling new methods for attacking outstanding questions related to condensed matter physics and materials science and enhancing knowledge of strongly correlated systems.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

无序是自然界中不可避免的，它会强烈影响支撑现代技术的材料的行为。物理学面临的一个紧迫问题是理解量子材料中无序和强粒子间相互作用的相互作用。强相互作用是诸如高温超导性等非凡现象的关键因素。在这些材料中，相互作用和无序是如何竞争或合作来影响超导性并产生新的量子态的，目前还没有完全弄清楚。被困在光学晶格中的超冷原子，这是一种由光形成的晶体，将被用作研究这一关键问题的模型系统。通过叠加光学散斑将引入可控和完全表征的无序，光学散斑是由随机分布的亮区和暗区组成的激光束。当无序和相互作用独立调节时，不同量子态的出现将被测量。从这个系统中获得的知识可能会导致更好地理解高温超导体和减轻无序对其性能的影响的技术。下一代工程师和科学家将接受激光科学、高频微波电子学和高速计算机控制信号的尖端技术培训。该项目建立在以前的晶格实验基础上，这些实验发现了使用Rb-87原子的无序诱导玻色子绝缘体，并观察到使用K-40原子的无序诱导金属-绝缘体转变。将继续开展两个项目，以解决关于三维空间中强相互作用和无序的相互作用的未决问题。首先，将使用Rb-87超精细组分的混合物被困在一个自旋相关的晶格上的浴对无序局域态的影响进行测量。第二，长程相互作用对量子局域化的影响将使用Rydberg敷料的K-40原子被困在一个无序的光学晶格。这些研究将推动无序量子气体的最新发展，从而为解决与凝聚态物理和材料科学相关的悬而未决的问题提供新的方法，并增强强相关系统的知识。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（3）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Disorder-controlled relaxation in a three-dimensional Hubbard model quantum simulator

三维哈伯德模型量子模拟器中的无序控制弛豫

DOI：
10.1103/physrevresearch.3.l012009
发表时间：
2021
期刊：
Physical Review Research
影响因子：
4.2
作者：
Morong, W.;Muleady, S. R.;Kimchi, I.;Xu, W.;Nandkishore, R. M.;Rey, A. M.;DeMarco, B.
通讯作者：
DeMarco, B.

Quantum Computer Systems for Scientific Discovery