Universal Few-Body Quantum States and Interactions

普遍的少体量子态和相互作用

基本信息

批准号：
2207977
负责人：
Chris Greene
金额：
$ 35.42万
依托单位：
Purdue University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2022
资助国家：
美国
起止时间：
2022-08-01 至 2025-07-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2207977&HistoricalAwards=false
关键词：
Universal Few Body Quantum States

项目摘要

This project advances scientific progress in a number of ways that relate to our national interest. The work will develop an understanding of a class of problems involving more than just two particles where current theory is extremely limited. Specifically, the group will extract new insights into the interaction of three or four or even a few more particles, which might be atoms or molecules or nucleons or even quarks. Those apparently dramatically different systems often show a universality, meaning that some aspects of one system are very similar and are even mirrored in other systems. This research advances one of the most promising theoretical methods for attacking this difficult class, which is based on the introduction of unusual collective coordinates that describe the motions of the system. Once the best coordinates have been selected, the project can implement the quantum mechanical equations on modern computers, and extract accurate numerical solutions. The project should yield credible predictions of new phenomena, and also qualitative insights that can suggest new paths that further advance this field of research. The effort also strengthens the pool of talent capable of tackling the most challenging theoretical questions in the microscopic world.The research planned for this proposal builds on progress in understanding currently interesting problems in universal few-body physics, stressing applications relevant to ultracold quantum systems. This active theoretical and experimental field has seen highly unusual bound and resonant states, as in the so-called Efimov effect, and it has also led to the development of theoretical methods, such as the adiabatic hyperspherical representation, which are capable of quantitatively describing inelastic collision and loss phenomena for collisions involving two to four atoms or molecules. The project will address the full parameter space of complexity of such ultracold few-body systems, both with and without an external electromagnetic field that can dress the system and modify its properties. The efforts will work to overcome the technical challenges associated with treating more than four atoms, pushing aggressively to treat five atoms in particular. Note that ultracold quantum gas physics links quantal phenomena across multiple subfields, notably atomic, molecular, optical, condensed matter, nuclear physics, and chemical physics. What is learned about the four-fermion system with ultracold atoms, for instance, can yield (and has yielded) insights into the nuclear physics problem of four interacting nucleons.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.

该项目以与我们国家利益有关的多种方式进行了科学进步。这项工作将对一系列问题产生理解，而这些问题涉及当前理论极为有限的两个粒子。具体而言，该组将提取新的见解，以解决三个或四个甚至几个颗粒的相互作用，即可能是原子，分子或核子，甚至是夸克。这些显然不同的系统通常显示出普遍性，这意味着一个系统的某些方面非常相似，甚至在其他系统中也反映了。这项研究推进了攻击这一困难类别的最有希望的理论方法之一，该方法基于描述系统动作的异常集体坐标的引入。一旦选择了最佳坐标，该项目就可以在现代计算机上实现量子机械方程，并提取准确的数值解决方案。该项目应产生对新现象的可靠预测，以及定性见解，这些见解可以提出新的途径，以进一步推进这一研究领域。这项努力还加强了能够解决微观世界中最具挑战性的理论问题的人才库。该提案计划的研究基于理解通用少体物理学目前有趣的问题的进展，强调与超级量子系统相关的应用。如所谓的Efimov效应，这一主动的理论和实验领域已经看到了高度不寻常的结合和共振状态，并且还导致了理论方法的发展，例如绝热的超级性超表征，它们能够定量地描述弹性碰撞和损失的碰撞现象，以涉及两到四到四到四到四个至四的碰撞。该项目将在有和没有外部电磁场的情况下解决此类超低少体系统复杂性的完整参数空间，该领域都可以打扮系统并修改其性质。这些努力将努力克服与处理四个以上原子相关的技术挑战，并促使人们尤其是治疗五个原子。请注意，Ultracold量子气体物理学将跨多个子场的数量现象联系起来，尤其是原子，分子，光学，冷凝物质，核物理学和化学物理学。例如，关于具有超速原子的四效系统的了解，可以产生（并已产生）对四个相互作用核子的核物理问题的见解。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来获得支持的。

项目成果

期刊论文数量（2）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

P -wave Efimov physics implications at unitarity

P 波 Efimov 对幺正性的物理意义

DOI：
10.1103/physreva.107.033329
发表时间：
2023
期刊：
Physical Review A
影响因子：
2.9
作者：
Chen, Yu-Hsin;Greene, Chris H.
通讯作者：
Greene, Chris H.

Observation of coherent oscillations in the association of dimers from a thermal gas of ultracold atoms

超冷原子热气体二聚体缔合中相干振荡的观察

DOI：
10.1103/physreva.107.l031304
发表时间：
2023
期刊：
Physical Review A
影响因子：
2.9
作者：
Elbaz, Roy;Yudkin, Yaakov;Giannakeas, P.;Rost, Jan-Michael;Greene, Chris H.;Khaykovich, Lev
通讯作者：
Khaykovich, Lev