光晶格调制中的偶极物质波孤子（英文）  

Dipolar Matter Wave Soliton Modulated by the Optical Lattice

作　　者：陈桂华[1] 

机构地区：[1]东莞理工学院电子工程学院,广东东莞523808

出　　处：《东莞理工学院学报》2015年第1期1-7,共7页Journal of Dongguan University of Technology

摘　　要：文章采用虚时间传播方法,研究了光晶格中势阱和缺陷在形成偶极物质波孤子中的作用。基孤子和偶极孤子都稳定地存在于晶格的中间位置。两种孤子的宽度都随着势阱深度的增加而急剧下降,并随着势阱深度超过某个阀值而趋向于一常数。增加系统的原子数目和增大势阱深度都可以让孤子更加稳定。我们还研究了缺陷对基孤子的影响。当缺陷的幅值超过某个临界值的时候,孤子被偏移晶格的中间位置,并且随着势阱的增大,缺陷的临界幅值也跟着增大,不过增大的幅度却逐渐减缓。The effects of the trap potential and defect on the formation of dipolar matter - wave solitons in the op- tical lattice are studied. The numerical simulation is carried out by the imaginary-time propagation method. Not only fun- damental solitons, but also odd solitons exist stably in the middle of the lattice. The width of both the fundamental and odd solitons decreases rapidly as the amplitude of the trap potential increases, and tends to be a constant when the am- plitude exceeds a certain threshold. The increase of both the atom number of the system and the amplitude of the trap po- tential can stabilize the solitons. The influence of a defect on fundamental soliton is also considered. Soliton is displaced from the middle of the lattice by the defect as the amplitude of the defect is exceeds a critical value. And with the in- creasing of the trap potential, this critical value ascends at a decreasing rate.

关 键 词：偶极原子 玻色爱因斯坦凝聚 光晶格 孤子 

分 类 号：O469[理学—凝聚态物理]