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arXiv 2005.01235cond-mat.quant-gasquant-ph
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简谐囚禁相互作用粒子的两体猝灭动力学

Two-body quench dynamics of harmonically trapped interacting particles

A. D. Kerin, A. M. Martin

摘要:

考虑了三维各向同性势阱中相互作用原子对的量子演化,其中相互作用强度从一个值猝灭到另一个值。使用静态问题的精确解,我们能够评估与时间相关的可观测量,例如初始状态和最终状态之间的重叠以及两个原子之间的间隔的期望值。在相互作用从非相互作用区到强相互作用区或相反的情况下,我们能够得到解析结果。检查的初始和最终状态之间的重叠,我们表明,当相互作用从非相互作用淬火到强相互作用制度的早期时间依赖动力学是一致的理论工作中的单杂质多体极限。当系统从强相互作用状态淬灭到非相互作用状态时,我们预测在两个原子之间的分离中会出现大的振荡,这是由于相互作用势的零程性质引起的对数发散。

英文摘要:

We consider the quantum evolution of a pair of interacting atoms in a three dimensional isotropic trap where the interaction strength is quenched from one value to another. Using exact solutions of the static problem we are able to evaluate time-dependent observables such as the overlap between initial and final states and the expectation value of the separation between the two atoms. In the case where the interaction is quenched from the non-interacting regime to the strongly interacting regime, or vice versa, we are able to obtain analytic results. Examining the overlap between the initial and final states we show that when the interaction is quenched from the non-interacting to strongly interacting regimes the early time dependence dynamics are consistent with theoretical work in the single impurity many-body limit. When the system is quenched from the strongly to non-interacting regime we predict large oscillations in the separation between the two atoms, which arises from a logarithmic divergence due to the zero-range nature of the interaction potential.

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