Fig. 1. (a) Moving atoms and counter propagating laser; (b) atoms with reduced momentum after absorbing photons; (c) atoms radiate photons in random directions.(a)运动的原子和反向传输的激光; (b)吸收光子动量减少的原子; (c)原子随机辐射光子

Fig. 2. Atoms are trapped by dipole force: (a) Red-detuning case;(b) blue-detuning case.偶极力捕获原子示意图 (a)红失谐; (b)蓝失谐

Fig. 3. Optical lattice with different dimension and corresponding atomic distributions: (a) One-dimension case; (b) two-dimension case; (c) three-dimension case.一维、二维和三维光晶格的产生以及原子在晶格中分布的示意图　(a)一维光晶格; (b)二维光晶格; (c)三维光晶格^[15,16]

Fig. 4. Spin-domain diagrams for condensates with . The cloud is separated into three domains with distinct boundaries in (b), components are miscible as shown in (a), all three components are generally miscible in (c). 旋量凝聚体的自旋畴示意图. 图(b)中, 时凝聚原子会分成三个畴而且有明显的边界, 相互作用会诱导畴边界交叠如图(a)和图(c)所示, 在图(c)中自旋畴已经没有了明显边界^[7]

Fig. 5. Spontaneous magnetization of atomic spin chain dominated by magnetic dipole-dipole interaction. is the magnetization components in the -axis direction, is intensity of the external magnetic field. The dashed line represents the mean-field result and the solid lines, from left to right, correspond to the exact numerical results for a two-site lattice with atoms. 原子自旋链中磁偶极-偶极相互作用诱导的自发磁化^[11] 这里纵轴 代表 方向的自发磁化强度, 横轴 是 平面上的外磁场强度, 虚线是平均场近似的结果, 数值模拟所得实线对应的是不同的格点填充数

Fig. 6. Spin waves are excited in atomic spin chain in optical lattice. Top: ferromagnetic ground-state structure of the spinor BEC atomic spin chain. Bottom: spin in each lattice site processes in spin space and spin waves can be excited.原子自旋链中自旋波的激发. 图的上部分是原子自旋链的铁磁基态示意图, 下部分是偶极-偶极相互作用下自旋进动在晶格方向的传播^[18]

Fig. 7. Magnetic soliton are excited by tuning external field: (a) Magnetic soliton are produced by tuning driving light field and trapping potential in red-detuning case, the vertical axis stands for the intensity of the modulated laser, and thehorizontal axis represents the transverse width of the condensate, the blank region corresponds to the existence of solitons; (b) magnetic soliton are produced by tuning trapping potential in blue-detuning case, the three lines correspond to the nearest-neighbor approximation (blue), the next-nearest-neighbor approximation (green),and the continuum limit approximation (red), respectively, magnetic solitons occur in the region . 通过控制外场实现磁孤子的产生 (a)红失谐光晶格中控制驱动光场和束缚场产生磁孤子, 是驱动光场的强度, 是晶格的横向囚禁宽度, 空白的区域对应有磁孤子产生, 反之, 暗的区域不能激发磁孤子; (b)蓝失谐光晶格中调节束缚场来产生磁孤子, 蓝线、绿线和红线分别代表考虑近邻、次近邻和长程的结果, 代表有磁孤子激发^[19]

Fig. 8. Spin waves are excited in atomic spin chain in optical lattice. We choose three transverse trapping widths of the condensate: (solid red line), (dashed blue line), and (dotted black line), respectively, the magnon squeezing states occur when . 通过调节束缚场实现磁振子压缩态 实红线、绿虚线和黑实线分别对应于横向囚禁宽度为 的情况, 代表产生了压缩^[19]

Fig. 9. Time evolution of the average squared transverse magnetization (red curve) and longitudinal magnetization (blue curve), the exponential growth of is shown in subgraph. 外磁场驱动下囚禁势中旋量凝聚体的横向和纵向的磁化随时间的演化 红线是横向的磁化 , 蓝线代表纵向的磁化 , 图中插图显示的是横向磁化被放大的过程^[23]

Fig. 10. Amplification factor as a function of the effective temperature under different intensities of the external modulation laser, the the dynamical Casimir effect at finite temperature take place if the proper parameters are selected.不同强度的驱动场下自旋起伏的放大倍数随有效温度的变化 图中红色圈、绿色方块和蓝色三角分别代表我们选择的不同的驱动光场强度, 通过适当选择光场强度可以使磁振子激发产生指数形式的增长, 也就是动力学卡西米尔效应^[18]