摘要
研究囚禁在环形势中的Rashba自旋轨道耦合玻色-爱因斯坦凝聚体在六极子磁场中的基态特性。在这种情况下,磁场破坏了自旋轨道耦合哈密顿量的旋转对称性,但系统仍具有2π/3的离散对称性。数值结果发现:在弱相互作用情况下,六极子磁场和Rashba自旋轨道耦合使环形囚禁的凝聚体呈类六边形的基态密度分布,当磁场强度超过某一临界值时,凝聚体将崩塌;在强相互作用情况下,半量子涡旋出现在凝聚体中,且被六极子磁场钉在方位角Ф=nπ/3的径向位置,涡旋的旋转方向取决于径向磁场的方向。
The ground states of Rashba spin-orbit coupled Bose-Einstein condensates are investigated in the presence of sextupole magnetic field.In this case,the rotational symmetry of the spin-orbit coupled Hamiltonian is broken by the sextupole magnetic field,but a discrete symmetry of 2π/3 maintains.Numerical results show that in the case of weak interaction,the hexagon-like structures appear in the ground-state condensates due to the coupling of the sextupole magnetic field and Rashba spin-orbit coupling,and when the magnetic field strength exceeds some critical value,the condensates collapse;in the case of strong interaction,half-quantum vortices appear in the condensates and are pinned by the sextupole magnetic field at the radial position with azimuth Ф=nπ/3(n being integer),and the winding direction of vortices depends on the direction of magnetic field.
作者
张瑞芳
李禄
ZHANG Rui-fang;LI Lu(Institute of Theoretical Physics,State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University,Taiyuan 030006,China)
出处
《量子光学学报》
北大核心
2020年第1期33-39,共7页
Journal of Quantum Optics
基金
国家自然科学基金(61475198)。
关键词
自旋轨道耦合
玻色-爱因斯坦凝聚体
环形势
六极子磁场
spin-orbit coupling
Bose-Einstein condensate
toroidal potential
sextupole magnetic field
作者简介
张瑞芳(1985-),女,山西吕梁人,博士研究生,主要从事冷原子方面的研究。E-mail:zhrfwgx@163.com;通信作者:李禄,E-mail:llz@sxu.edu.cn。
