Spin-orbit coupling in Bose-Einstein condensate and degenerate Fermi gases
Spin-orbit coupling in Bose-Einstein condensate and degenerate Fermi gases
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DOI：
10.1007/s11467-013-0377-x
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发表时间：
2014-10
影响因子：
7.5
通讯作者：
Pengjun Wang;Jing Zhang
中科院分区：
文献类型：
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作者：
Pengjun Wang;Jing Zhang
我们回顾了我们最近的实验实现和研究自旋轨道（SO）耦合玻色-爱因斯坦凝聚体（BEC）和量子简并费米气体。利用两台反向传输的拉曼激光器，通过控制两台拉曼激光器的不同频率来控制原子与光的相互作用，首次研究了BEC中的SO耦合。然后我们研究了费米气体中的SO耦合。我们观察到的自旋退相的自旋动力学和动量分布的不对称性的平衡态的SO耦合在费米气体的标志。为了更清楚地揭示SO耦合费米气体的性质，我们还研究了表征量子态的能量-动量色散和自旋组成的动量分辨射频光谱。我们观察到了不同螺旋度分支中费米面随原子密度的变化，这表明通过进一步冷却系统可以发现费米面拓扑变化的Lifshitz跃迁。最后，我们研究了超冷费米气体的动量分辨拉曼光谱。
We review our recent experimental realization and investigation of a spin-orbit (SO) coupled Bose-Einstein condensate (BEC) and quantum degenerate Fermi gas. By using two counter-propagating Raman lasers and controlling the different frequency of two Raman lasers to engineer the atom-light interaction, we first study the SO coupling in BEC. Then we study SO coupling in Fermi gas. We observe the spin dephasing in spin dynamics and momentum distribution asymmetry of the equilibrium state as hallmarks of SO coupling in a Fermi gas. To clearly reveal the property of SO coupling Fermi gas, we also study the momentum-resolved radio-frequency spectroscopy which characterizes the energy-momentum dispersion and spin composition of the quantum states. We observe the change of fermion surfaces in different helicity branches with different atomic density, which indicates that a Lifshitz transition of the Fermi surface topology change can be found by further cooling the system. At last, we study the momentum-resolved Raman spectroscopy of an ultracold Fermi gas.