深光晶格势阱中凝聚体的扭结包络隙孤子  

Kink-envelope gap soliton of the condensates trapped in the deep optical lattices

作　　者：杨如曙[1] 杨江河[1] YANG Ru-Shu;YANG Jiang-He(Department of computer and Electric Engineering,Hunan University of Arts and Science,Changde 415000,China)

机构地区：[1]湖南文理学院计算机与电气工程学院,常德415000

出　　处：《原子与分子物理学报》2022年第4期102-108,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11832016,55775471)。

摘　　要：发展准离散多尺度法结合紧束缚近似,解析地研究了局陷于光晶格势阱中凝聚体的非线性动力学性质.结果发现,系统中出现稳定的对称包络孤子外,还可观察到一种新的非线性元激发:扭结包络隙孤子.有趣的是,该隙孤子并不传播且局域在初始位置,其幅度可通过光晶格势阱的晶格常数和势阱深度来调控.相应的实验方案是:通过改变形成光晶格势阱的两交叉耦合激光束之间的夹角和(或)激光光强来调控扭结包络隙孤子的幅度.By developing quasi-discrete multiple-scale method combined with tight-binding approximation, the nonlinear dynamical properties of the condensates trapped in the optical lattices are studied analytically. It is shown that besides the usual symmetric envelope soliton appears in this system, a novel nonlinear elementary excitation, kink-envelope gap soliton, is also observed. Interestingly, these solitons are non-propagation and localized at initial position. Furthermore, the amplitude of the kink-envelope gap soliton can be adjusted by the lattice spacing and depth of the optical lattices. Accordingly, we provide experimental protocols to control the amplitude of the kink-envelope soliton by varying the light intensity and/or the angle between the intersecting laser beams forming the optical lattice.

关 键 词：扭结包络隙孤子 玻色-爱因斯坦凝聚 光晶格势阱 

分 类 号：O415[理学—理论物理]