原子-原子-离子三体复合中的势垒下峰
Sub-barrier peaks in atom-atom-ion three-body recombination
- Albert-Ludwigs-Universität Freiburg（弗赖堡大学）
- Universität Stuttgart（斯图加特大学）
- University of Warsaw（华沙大学）
机构由 AI 辅助整理，请以论文原文为准。
中文总结 AI 辅助
本文构建两步林德曼型模型，揭示原子-原子-离子三体复合中高分波通道的三体复合截面可在远低于离心势垒处出现峰值，该效应可在现有混合实验中观测，为表征原子-离子费什巴赫共振提供新途径。
中文摘要 AI 辅助
混合原子-离子实验近期已进入少分波区域，在此区域中，磁可调费什巴赫共振主导三体损失动力学，这要求三体复合的理论处理需纳入共振二聚体通道的作用。本文针对共振原子-原子-离子三体复合，构建了两步林德曼型模型，该模型将适用于长程极化势的多通道量子亏损理论，与非弹性原子-二聚体步骤的通用量子俘获处理相结合。研究表明，在该模型中，速率竞争会导致高分波通道的三体复合截面在远低于其相应离心势垒的能量处出现峰值。通过对数值得到的非热碰撞能量分布下的损失率进行研究，发现这些效应在能量平均后依然存在，可在当前最先进的混合实验装置中观测到。本研究成果为通过分析非弹性三体复合过程来详细表征原子-离子费什巴赫共振铺平了道路。
英文摘要
Hybrid atom-ion experiments have recently entered the few-partial wave regime in which magnetically tunable Feshbach resonances dominate the three-body loss dynamics. This necessitates a treatment of three-body recombination that can incorporate the role of the resonant dimer channel. Here, we develop a two-step Lindemann-type model for resonant atom-atom-ion three-body recombination that combines multichannel quantum-defect theory for the long-range polarization potential with a universal quantum-capture treatment of the inelastic atom-dimer step. We show that within our model, rate competition can lead to a peak in the three-body-recombination cross section of higher partial-wave channels at energies well below their corresponding centrifugal barrier. Investigating the resulting loss rates under numerically obtained non-thermal collision-energy distributions, we find that these effects survive the energy averaging and can be observed in state-of-the-art hybrid experimental setups. Our findings pave the way for a detailed characterization of atom-ion Feshbach resonances via the analysis of inelastic three-body-recombination processes.
