环形势阱中自旋-轨道耦合旋转玻色-爱因斯坦凝聚体的基态

研究了在环形势阱中自旋-轨道耦合旋转玻色-爱因斯坦凝聚体的基态结构.探索了自旋-轨道耦合作用和旋转效应对基态的影响.结果发现,在环形势阱下,基态结构呈现环形分布的half-skyrmion链.调节自旋-轨道耦合强度,不仅可以改变体系内half-skyrmion数量,而且能够调控half-skyrmion环形排列的对称性.随着旋转频率增大,体系从平面波相转化为环形对称排列的half-skyrmion链相,最后过渡到三角格子的half-skyrmion相.讨论了自旋相互作用和势阱形状对基态的影响.自旋-轨道耦合强度和旋转频率作为体系的调控参数,可用于控制不同基态相间的转化.     

Spin–orbit-coupled spin-1 Bose–Einstein condensates confined in radially periodic potential

We investigate the ground states of spin-1 Bose–Einstein condensates (BECs) with spin–orbit coupling in a radiallyperiodic potential by numerically solving the coupled Gross–Pitaevskii equations. In the radially periodic potential, wefirst demonstrate that spin–orbit-coupled antiferromagnetic BECs support a multiring petal phase. Polar–core vortex canbe observed from phase profiles, which is manifested as circularly symmetric distribution. We further show that spin–orbitcoupling can induce multiring soliton structure in ferromagnetic BECs. It is confirmed especially that the wave-functionphase of the ring corresponding to uniform distribution satisfies the rotational symmetry, and the wave-function phase ofthe ring corresponding to partial splitting breaks the rotational symmetry. Adjusting the spin–orbit coupling strength cancontrol the number of petal in antiferromagnetic BECs and the winding numbers of wave-function in ferromagnetic BECs.Finally, we discuss effects of spin-independent and spin-dependent interactions on the ground states.     

多模式原子干涉仪的相位研究

在本文中,我们研究了谐振子势阱(频率为ω)中多模式原子干涉仪相位演化的动力学特性.第一次Kapitza-Dirac脉冲产生出了具有不同相位的模式.外场的作用使这些模式的相位演化相对于没有外场下的演化发生了偏离.Kapitza-Dirac脉冲的强度不会对相位演化产生任何影响.在第二次Kapitza-Dirac脉冲后,外场作用使t=π/(2ω)之前已经存在的非零模式相位发生突变.对于外场是重力场,测量时刻相邻两模式之间的相位差和重力加速度成线性关系.