Observing S-Matrix Pole Flow in Resonance Interplay

IF 1.7 4区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Few-Body Systems Pub Date : 2024-05-25 DOI:10.1007/s00601-024-01930-4

Matthew Chilcott, Samyajit Gayen, James Croft, Ryan Thomas, Niels Kjærgaard

引用次数: 0

Abstract

We provide an overview of experiments exploring resonances in the collision of ultracold clouds of atoms. Using a laser-based accelerator that capitalises on the energy resolution provided by the ultracold atomic setting, we unveil resonance phenomena such as Feshbach and shape resonances in their quintessential form by literally photographing the halo of outgoing scattered atoms. We exploit the tunability of magnetic Feshbach resonances to instigate an interplay between scattering resonances. By experimentally recording the scattering in a parameter space spanned by collision energy and magnetic field, we capture the imprint of the S-matrix pole flow in the complex energy plane. After revisiting experiments that place a Feshbach resonance in the proximity of a shape resonance and an anti-bound state, respectively, we discuss the possibility of using S-matrix pole interplay between two Feshbach resonances to create a bound-state-in-the-continuum.

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观测共振相互作用中的 S 矩阵极流

我们概述了探索超冷原子云碰撞共振的实验。我们使用基于激光的加速器，利用超冷原子环境提供的能量分辨率，通过拍摄外向散射原子的光环，揭示了共振现象的本质形式，如费什巴赫共振和形状共振。我们利用磁性费什巴赫共振的可调谐性来激发散射共振之间的相互作用。通过实验记录碰撞能量和磁场跨越的参数空间中的散射，我们捕捉到了复能面上 S 矩阵极流的印记。在重温了将费什巴赫共振分别置于形状共振和反束缚态附近的实验之后，我们讨论了利用两个费什巴赫共振之间的 S 矩阵极相互作用来创建真空中束缚态的可能性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Few-Body Systems 物理-物理：综合

CiteScore

2.90

自引率

18.80%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Few-Body Systems presents original research work – experimental, theoretical and computational – investigating the behavior of any classical or quantum system consisting of a small number of well-defined constituent structures. The focus is on the research methods, properties, and results characteristic of few-body systems. Examples of few-body systems range from few-quark states, light nuclear and hadronic systems; few-electron atomic systems and small molecules; and specific systems in condensed matter and surface physics (such as quantum dots and highly correlated trapped systems), up to and including large-scale celestial structures. Systems for which an equivalent one-body description is available or can be designed, and large systems for which specific many-body methods are needed are outside the scope of the journal. The journal is devoted to the publication of all aspects of few-body systems research and applications. While concentrating on few-body systems well-suited to rigorous solutions, the journal also encourages interdisciplinary contributions that foster common approaches and insights, introduce and benchmark the use of novel tools (e.g. machine learning) and develop relevant applications (e.g. few-body aspects in quantum technologies).