PT对称势下自旋轨道耦合玻色-爱因斯坦凝聚体的能带结构  

Band structures in spin-orbit coupled Bose-Einstein condensate with PT symmetric potential

作　　者：邵凯花 马金萍 王青青 席保龙 石玉仁[1] SHAO Kai-hua;MA Jin-ping;WANG Qing-qing;XI Bao-Long;SHI Yu-ren(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2024年第3期42-47,共6页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(12065022)。

摘　　要：数值研究PT对称势下具有自旋轨道耦合玻色-爱因斯坦凝聚体的能带结构.用傅立叶配置法求解布洛赫能带,分析PT对称晶格势的深度、虚部相对大小、自旋轨道耦合强度和拉比耦合强度对能带结构的影响.结果表明,第一、二能带的上下边沿随晶格深度的增加而上升,但能带宽度变窄;当PT对称晶格势的虚部大于临界值时,第一和第二能带发生重叠;随着自旋轨道耦合强度的增大,第一和第二能带的上下边界均减小;拉比耦合强度对能带结构也具有重要影响.The band structures in spin-orbit coupled Bose-Einstein condensate with PT symmetric potential are investigated numerically.The Bloch bands are obtained by the Fourier collocation method and the effects of the depth of PT symmetric lattice potential,the magnitude of imaginary part,the spin-orbit coupled strength and the Rabi coupling strength on band structures are analyzed.The results indicate that the upper and lower boundaries of the first and second bands increase with the increase of lattice depth,but the width of band becomes narrower.The first and second bands overlap when the imaginary part of the PT symmetric lattice potential is larger than the critical value.For the first and second bands,their upper and lower boundaries decrease with the increase of spin-orbit coupled strength.It is alsOfound that the Rabbi coupling strength alsOhas an important effect on the band structure.

关 键 词：玻色-爱因斯坦凝聚 PT对称势 自旋轨道耦合 能带结构 

分 类 号：O145[理学—数学]