Directed momentum current of Bose–Einstein condensate in the presence of spatially modulated nonlinear interaction
Directed momentum current of Bose–Einstein condensate in the presence of spatially modulated nonlinear interaction
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DOI：
10.1088/0953-4075/49/12/125303
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发表时间：
2016-05
期刊：
影响因子：
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通讯作者：
Wen-Lei Zhao;Caiyun Ding;Jie Liu;L. Fu
中科院分区：
文献类型：
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作者：
Wen-Lei Zhao;Caiyun Ding;Jie Liu;L. Fu
研究了周期性δ-踢玻色-爱因斯坦凝聚体在空间调制非线性相互作用下的量子输运动力学。空间调制频率对超冷原子的输运行为有显著的影响。对于奇频率，非线性相互作用不太强时，定向电流的线性增长接近于无相互作用时的线性增长。随着频率的增加，加速度和量子态的演化都逐渐接近无相互作用的情况。对于其他频率值，非常弱的非线性相互作用可以显著降低定向电流的线性增长。量子态的演化与无相互作用的情况迅速不同。揭示了潜在的动力学机制，并提出了一些重要的意义。
We investigate the quantum transport dynamics of periodically delta-kicked Bose–Einstein condensate under the effect of spatially modulated nonlinear interactions. The spatial modulation frequency can dramatically affect the transport behaviors of the ultra-cold atoms. For odd frequency, the linear growth of the directed current is close to that of the noninteracting case for not very strong nonlinear interaction. Both the acceleration and the quantum state evolution gradually approach that of the noninteracting case with increasing frequency. For other values of frequency, a very weak nonlinear interaction can dramatically reduce the linear growth of the directed current. The quantum state evolution differs rapidly from that of the noninteracting case. The underlying dynamic mechanism is uncovered and some important implications are addressed.