Properties of Bose gases with the Raman-induced spin–orbit coupling
Properties of Bose gases with the Raman-induced spin–orbit coupling
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DOI：
10.1088/0953-4075/46/13/134007
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发表时间：
2012-12
期刊：
影响因子：
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通讯作者：
Wei-mou Zheng;Zeng-Qiang Yu;Xiaoling Cui;H. Zhai
中科院分区：
文献类型：
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作者：
Wei-mou Zheng;Zeng-Qiang Yu;Xiaoling Cui;H. Zhai
本文研究了具有拉曼诱导自旋轨道耦合的玻色气体的性质。结果表明，SO耦合可以极大地改变单粒子态密度，从而导致非相互作用玻色-爱因斯坦凝聚（BEC）的凝聚耗尽、基态能量的Lee-Huang-Yang修正和相变温度的非单调性. SO耦合的存在也打破了伽利略不变性，这给出了两个不同的临界速度，分别对应于凝聚体和杂质的运动。最后，我们表明，与SO耦合，相互作用修改的BEC转变温度，即使在Hartree-Fock水平，在没有SO耦合的普通玻色气体。所有结果都可以在现有的拉曼激光诱导规范场冷原子实验中得到直接验证。
In this paper we investigate the properties of Bose gases with Raman-induced spin–orbit (SO) coupling. It is found that the SO coupling can greatly modify the single-particle density of state, and thus leads to the non-monotonic behaviour of the condensate depletion, the Lee–Huang–Yang correction of ground-state energy and the transition temperature of a non-interacting Bose–Einstein condensate (BEC). The presence of the SO coupling also breaks the Galilean invariance, and this gives two different critical velocities, corresponding to the movement of the condensate and the impurity respectively. Finally, we show that with the SO coupling, the interactions modify the BEC transition temperature even at the Hartree–Fock level, in contrast to the ordinary Bose gas without the SO coupling. All results presented here can be directly verified in the current cold atom experiments using the Raman laser-induced gauge field.