具有角动量的由碱土金属与氦组成的弱束缚三原子体系研究

项目名称： 具有角动量的由碱土金属与氦组成的弱束缚三原子体系研究

项目编号： No.11464020

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 勾庆东

作者单位： 井冈山大学

项目金额： 34万元

中文摘要： 弱束缚三体量子体系的研究是现代物理理论与实验研究的热点之一，涉及到三体量子系统的halo态、Efimov态；冷原子分子；及玻色-爱因斯坦凝聚等领域。物理系统在超低温环境下形成稳定结构的过程中，弱束缚分子起着非常重要的作用。对弱束缚三体量子体系的研究将有助于理解冷原子分子及玻色-爱因斯坦凝聚体系。碱土金属元素有两个价电子的电子结构，并且碱土金属原子中主要的同位素都是核自旋为0的玻色子，因此这些原子中不存在复杂的超精细结构。这些特点使得碱土金属元素成为研究多种物理问题的对象，其与氦原子间的弱相互作用也是研究弱束缚系统的理想对象。本项目利用含有B-样条及绝热近似的超球坐标方法系统地研究碱土金属与氦组成的弱束缚三体分子体系在总轨道角动量不为零情况下的性质，可以为冷原子分子和玻色-爱因斯坦凝聚的实验研究提供理论指导。

中文关键词： 弱束缚少体系统；Halo态；超球坐标方法；B样条；碱土金属

英文摘要： Study on the weakly bound three-body quantum system is a hot spot of modern theoretical and experimental investigation,involving three-body halo effect and Efimov effect of quantum system;cold atoms and molecules;Bose-Einstein condensation, and other different fields of physics. Weakly bound molecular clusters play a very important role in the formation of stable structures at very low temperatures.Studies of the weakly bound system have deepened our understanding of Efimov physics and halo effect, low-energy three-body scattering, and the Bose-Einstein condensate.The major isotopes of alkaline earth atoms have no nuclear spin,and thus do not have any complicating hyperfine structure,and the characteristic of electron structure of alkaline earth elements offers various opportunities to study different physical topics.The weak interactions between helium atoms and alkaline earth atoms are also ideal objects for investigation of weakly bound systems.This project is based on b-spline and the adiabatic hyperspherical coordinates. We will systematically study the weakly bound alkaline-earth-helium three-atom systems with non-zero total nuclear orbital angular momentum. The investigation could provide theoretical guidance in experiments of cold atoms and molecules,and Bose-Einstein condensate.

英文关键词： Weekly bound trimer;Halo state;hyperspherical coordinates;B-Spline;alkaline-earth metal