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arXiv 0901.3345cond-mat.otherquant-ph
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光晶格中玻色-爱因斯坦凝聚体不稳定性引起的脉动的量子动力学

Quantum dynamics of instability-induced pulsations of a Bose-Einstein condensate in an optical lattice

Uttam Shrestha, Juha Javanainen, Janne Ruostekoski

摘要:

研究了在弱相互作用下一维光晶格中玻色-爱因斯坦凝聚体的动力学行为,包括量子涨落的近似模型。在时间演化过程中,原子周期性地聚集在一起,随后又分散回到初始均匀态的脉动动力学不稳定性可能发生。我们考虑到截断维格纳近似下的量子涨落。我们观察到,准周期行为仍然持续为一个单一的实现,代表了一个典型的实验结果,但系综平均值显示各种表现的量子涨落。当有效相互作用强度增加时,量子效应变得更加突出。

英文摘要:

We study the dynamics of a Bose-Einstein condensate in a one-dimensional optical lattice in the limit of weak atom-atom interactions, including an approximate model for quantum fluctuations. A pulsating dynamical instability in which atoms periodically collect together and subsequently disperse back into the initial homogeneous state may occur in the time evolution. We take into account the quantum fluctuations within the truncated Wigner approximation. We observe that the quasiperiodic behavior still persists for a single realization that represents a typical experimental outcome, but ensemble averages show various manifestations of quantum fluctuations. Quantum effects become more prominent when the effective interaction strength is increased.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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