当前位置:科学网首页 > 小柯机器人 >详情
一种用于研究Efimov物理的多通道超球面模型
作者:小柯机器人 发布时间:2023/6/1 11:18:08

近日,瑞典斯德哥尔摩大学的Kajsa-My Tempest与Svante Jonsell合作并取得一项新进展。经过不懈努力,他们提出了一种多通道超球面模型,用于研究由Feshbach共振控制的范德华相互作用下的Efimov物理。相关研究成果已于2023年5月30日在国际知名学术期刊《物理评论A》上发表。

该研究团队提出了一个四通道模型,其中包括一个具有磁性调谐的Feshbach共振,该共振适用于通过成对范德华相互作用而相互作用的三个原子系统。该研究的方法旨在模拟最近的实验,该实验利用可调节的散射长度来研究三体Efimov态,这些态在两体散射长度发散的极限情况下出现。利用该模型,研究人员计算了三体绝热和有效势能曲线,并研究了Feshbach共振的强度(或宽度)对与Efimov效应相关的三体有效超径向势的影响。

研究发现,研究发现,在接近窄共振极限时,用于解释宽共振中的范德华普适性斥力势垒的位置发生轻微偏移,并且这种偏移与绝热能量景观中出现的两个避交叉现象相关。更重要的是,在最窄的共振情况下,引力势在能量中明显向上偏移,并且变得非常浅。研究人员认为这种行为与弱(窄)共振时范德华普适性的破坏有关。

附:英文原文

Title: Multichannel hyperspherical model for Efimov physics with van der Waals interactions controlled by a Feshbach resonance

Author: Kajsa-My Tempest, Svante Jonsell

Issue&Volume: 2023/05/30

Abstract: Here we present a four-channel model that incorporates a magnetically tunable Feshbach resonance in a system of three atoms that interact via pairwise van der Waals interactions. Our method is designed to model recent experiments where the tunability of the scattering length has been used to study three-body Efimov states, which appear in the limit of a diverging two-body scattering length. Using this model, we calculate three-body adiabatic and effective potential curves and study how the strength (or width) of the Feshbach resonance affects the three-body effective hyperradial potential that is connected to the Efimov effect. We find that the position of the repulsive barrier, which has been used to explain the so-called van der Waals universality in broad resonances, is slightly shifted as the narrow-resonance limit is approached and that this shift is correlated to the appearance of two avoided crossings in the adiabatic energy landscape. More importantly, the attractive well is markedly shifted upward in energy and is extremely shallow for the narrowest resonance. We argue that this behavior is connected to the breakdown of van der Waals universality for weak (narrow) resonances.

DOI: 10.1103/PhysRevA.107.053319

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.053319

期刊信息

Physical Review A:《物理评论A》,创刊于1970年。隶属于美国物理学会,最新IF:2.97
官方网址:https://journals.aps.org/pra/
投稿链接:https://authors.aps.org/Submissions/login/new