Rydberg Electrons as a Probe for Ultracold Systems

里德伯电子作为超冷系统的探针

• 批准号: 2034284
• 负责人: Robin Cote
• 金额: $ 24万
• 依托单位: University of Massachusetts Boston
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2034284&HistoricalAwards=false
• 关键词: Rydberg; Electrons; Probe; Ultracold; Systems

This project seeks to utilize Rydberg excitations, promotion of an electron in an atom to a very high energy level, to probe novel properties of ultracold gases. Rydberg atoms within an ultracold gas move very slowly, resulting in long collision times and large cumulative effects of even very weak interatomic forces. The large spatial extent of the Rydberg electron also renders the Rydberg atom sensitive to local field environments. The combination of these two factors, slow speed and large spatial volume, makes ultracold Rydberg atoms ideal probes of delicate correlations and other novel phenomena within the ultracold environment. During the past few years, experimental progress in preparing and manipulating ultracold Rydberg atoms has led to many new developments in Atomic, Molecular, and Optical (AMO) Physics. For example, Rydberg atoms have made possible the detection of a new class of long-range molecules, the so-called "trilobite"-like molecules, and of fast quantum gates relevant to the quantum information revolution. They are now utilized to make small regions of an otherwise opaque gas transparent, using what is known as electromagnetically induced transparency. Rydberg atoms can also generate single photon sources and mediate photon-photon interactions. Accordingly, ultracold Rydberg atom research bridges AMO, condensed matter and mesoscopic physics, and quantum information science, as well as ultracold chemistry. This theory project models the interactions of Rydberg electrons with their environment in order to better understand and predict observed spectra, which are expected to depend sensitively on the distribution of atoms in the gas, and enhance their utilization in the range of areas mentioned above. This research program explores how Rydberg electrons can be used to investigate few- and many-body phenomena. Rydberg electrons provide a low-energy and well-localized probe for AMO, condensed-matter, and chemical systems. While their wave function extends to large volumes, Rydberg electrons, being excited near the ionization threshold, have a small kinetic energy that minimally perturbs a system to be investigated. Rydberg electrons can scatter from one, two, or many ground-state atoms depending on the density of neighboring atoms. The effect of those scatterers on the Rydberg electron wave function can be used to study the properties of the ground-state atoms, such as their distribution and correlation, including in degenerate Bose or Fermi gases. In particular, the special case of two scatterers can shed light on Efimov physics, a three-body system with peculiar properties introduced in nuclear physics. To carry out this research, accurate wave functions are essential ingredients that current methods struggle to provide. Here, a non-perturbative approach based on Green's functions to compute wave functions and potential energy surfaces for Rydberg trilobite-like dimers, trimers, etc., will be developed. These accurate wave functions will then be employed in the calculation of photo-association (PA) spectra whose detailed lineshapes will unlock the information about the ground-state atoms, including their correlation (from two, three, four, or N-body). Finally, together with the computation of the Efimov wave functions, the probing of those elusive states with spectroscopic accuracy will be made possible.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.

该项目旨在利用Rydberg激发，将原子中的电子促进到非常高的能级，以探测超低气体的新型特性。超速气体中的Rydberg原子非常缓慢，导致较长的碰撞时间和较弱的原子间力累积影响。 Rydberg Electron的大空间范围也使Rydberg原子对本地现场环境敏感。这两个因素的结合，慢速和大空间体积，使得超低的rydberg原子理想的探针是微妙的相关性和在超低环境中的其他新现象。在过去的几年中，在制备和操纵超低rydberg原子方面的实验进展导致了原子，分子和光学（AMO）物理学的许多新发展。例如，rydberg原子使检测一类新的远程分子，所谓的“三叶虫”类似分子以及与量子信息革命相关的快速量子门。现在，使用所谓的电磁诱导的透明度，它们被用来使原本不透明气体透明的小区域的小区域。 Rydberg原子还可以产生单个光子源并介导光子 - 光子相互作用。因此，Ultrocold Rydberg Atom Research Bridges AMO，凝结物质和介质物理学以及量子信息科学以及Ultracold Chemistry。该理论项目对Rydberg电子与其环境的相互作用进行了建模，以便更好地理解和预测观察到的光谱，这些光谱有望敏感地依赖于原子在气体中的分布，并在上述区域范围内提高了其利用率。该研究计划探讨了Rydberg电子如何用于研究少数和多体现象。 Rydberg电子为AMO，凝结物和化学系统提供了低能且稳定的探针。尽管它们的波函数扩展到大量的量，但在电离阈值附近激发的Rydberg电子具有很小的动能，可将一个系统的系统最小化。 Rydberg电子可以根据相邻原子的密度从一个，两个或许多地下原子散射。这些散射体对Rydberg电子波函数的影响可用于研究地种原子的特性，例如它们的分布和相关性，包括在退化的玻色或费米气体中。特别是，两个散射器的特殊情况可以揭示Efimov Physics，这是一种三体系统，具有核物理学中引入的特殊特性。为了进行这项研究，准确的波函数是当前方法难以提供的重要成分。在这里，将开发一种基于Green的功能，用于计算Rydberg Trilobite类似二聚体，三聚体等的势能表面的非扰动方法。然后，这些准确的波函数将用于计算光关系（PA）光谱的计算，其详细的线形将解锁有关地面原子的信息，包括它们的相关性（来自两个，三个，四个，四个或N体）。最后，加上Efimov波函数的计算，将使这些难以捉摸的状态进行探测。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智力优点和更广泛影响的审查标准通过评估来获得支持的。

项目成果

Phase-amplitude formalism for ultranarrow shape resonances

超窄形状共振的相位幅度形式主义

• DOI: 10.1103/physreva.99.022709
• 发表时间: 2019
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Simbotin, I.;Shu, D.;Côté, R.
• 通讯作者: Côté, R.

Model of charge transfer collisions between C 60 and slow ions

C 60 与慢离子之间的电荷转移碰撞模型

• DOI: 10.1063/5.0100357
• 发表时间: 2022
• 期刊: The Journal of Chemical Physics
• 作者: Smucker, J.;Montgomery, J. A.;Bredice, M.;Rozman, M. G.;Côté, R.;Sadeghpour, H. R.;Vrinceanu, D.;Kharchenko, V.
• 通讯作者: Kharchenko, V.

Inner energy relaxation and growth of nanosize particles

• DOI: 10.1103/physreva.108.032812
• 发表时间: 2023-03
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: M. Bredice;M. Rozman;J. Smucker;E. Farmer;Robin Cot'e;V. Kharchenko

Homonuclear ion-atom collisions: Application to Li+−Li

同核离子原子碰撞：在 Li 上的应用

• DOI: 10.1103/physreva.105.063311
• 发表时间: 2022
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Joshi, N.;Niranjan, M.;Pandey, A.;Dulieu, Olivier;Côté, Robin;Rangwala, S. A.
• 通讯作者: Rangwala, S. A.

Rydberg electron-atom scattering in forbidden regions of negative kinetic energy

负动能禁区内的里德伯电子原子散射

• DOI: 10.1088/1361-6455/ab7526
• 发表时间: 2020
• 期刊: Molecular and Optical Physics
• 作者: Stanojevic, Jovica;Côté, Robin
• 通讯作者: Côté, Robin