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arXiv 0906.3976cond-mat.quant-gasquant-ph
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双势阱中玻色-爱因斯坦凝聚体的绝热分裂、输运和自陷

Adiabatic Splitting, Transport, and Self-Trapping of a Bose-Einstein Condensate in a Double-Well Potential

C. Ottaviani, V. Ahufinger, R. Corbalán, J. Mompart

摘要:

我们证明了双势阱中玻色-爱因斯坦凝聚体(BEC)的绝热动力学可以用一个暗变量来描述,这个暗变量是由两个势阱之间的粒子数不平衡和空间原子相干性共同作用的结果.通过这个暗变量,我们扩展,非线性物质波的情况下,最近的建议Vitanov和Shore [Phys.Rev.A73,053402(2006)]绝热通道技术相干控制人口的两个内部能级的原子/分子。我们研究的条件,以绝热分裂或运输BEC以及准备一个绝热自陷态的隧穿率的最佳延迟时间变化通过两个阱之间的能量偏置或BEC非线性。系统的非线性本征态和不稳定定态解的出现以及它们在绝热动力学崩溃中的作用被详细研究。

英文摘要:

We show that the adiabatic dynamics of a Bose-Einstein condensate (BEC) in a double well potential can be described in terms of a dark variable resulting from the combination of the population imbalance and the spatial atomic coherence between the two wells. By means of this dark variable, we extend, to the non-linear matter wave case, the recent proposal by Vitanov and Shore [Phys. Rev. A 73, 053402 (2006)] on adiabatic passage techniques to coherently control the population of two internal levels of an atom/molecule. We investigate the conditions to adiabatically split or transport a BEC as well as to prepare an adiabatic self trapping state by the optimal delayed temporal variation of the tunneling rate via either the energy bias between the two wells or the BEC non-linearity. The emergence of non-linear eigenstates and unstable stationary solutions of the system as well as their role in the breaking down of the adiabatic dynamics is investigated in detail.

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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