拉盖尔-高斯光束调控冷原子自旋织构的数值分析

Numerical analysis of cold-atom spin texture manipulated by Laguerre-Gaussian laser beams

超冷原子旋量玻色-爱因斯坦凝聚体中存在诸多具有不同拓扑属性的自旋织构,可以为凝聚态物理、粒子物理等领域中拓扑结构的研究提供理想的量子模拟平台。拉盖尔-高斯光束具有特定的空间结构且携带确定的轨道角动量,可用于研究冷原子中的自旋织构。通过数值模拟讨论拉盖尔-高斯光束驱动F=1三能级原子系统的双光子拉曼过程,在光斑尺寸与原子团大小可比拟的情况下,分别从初态处于铁磁相和极化相的凝聚体中得到斯格明子结构,并据此提出一种精确获取光斑尺寸的方法,用于标定拉曼耦合强度,为后续实验提供参考。

Ultra-cold atomic spinor Bose-Einstein condensate has many spin textures with different topological properties,which can provide an ideal quantum simulation platform for the study of topological structures in condensed matter physics and particle physics.The Laguerre-Gaussian beam has special spatial structure and carrys a certain orbital angular momentum,which has been used to research spintexture in ultra-cold atoms.Studying the two-photon Raman process in F=1 three level atom system driven by Laguerre-Gaussian light by numerical simulation can obtain Skyrmion when the initial state is the ferromagnetic phase or the polarization phase under the condition that the beam waist is comparable with the size of the atomic cloud,and based on that,a numerical method for acquiring precise beam waist can be proposed,which provides a reference for subsequent experiments.