Controlling the velocities and the number of emitted particles in the tunneling to open space dynamics
Controlling the velocities and the number of emitted particles in the tunneling to open space dynamics
复制标题
控制开放空间动力学隧道中发射粒子的速度和数量
DOI：
10.1103/physreva.89.053620
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发表时间：
2014
影响因子：
2.9
通讯作者：
Lorenz S. Cederbaum
中科院分区：
文献类型：
--
作者：
Axel U. J. Lode;Shachar Klaiman;Ofir E. Alon;Alexej I. Streltsov;Lorenz S. Cederbaum
设计并演示了一种控制从陷阱通过势垒到开放空间的多玻色子隧道过程的方案。喷射粒子的数量及其速度可以通过两个参数控制，即电势阈值和粒子间相互作用。采用最近开发的高效多体方法，可以精确地计算一个空间维度中两个、三个和一百个相互作用的玻色子的结果，从而解决普遍感兴趣的复杂问题。结果表明，为多玻色子隧道过程设计的控制方案在动量密度、相关性和相干性以及陷阱中剩余粒子数量的动力学方面表现良好。为了解释多体隧道过程，导出了从单粒子发射过程组装多体过程的透明模型。对可用衰变通道的能量学分析以及数值结果排除了两个（或多个）玻色子一起隧道到开放空间的情况。目前的调查概括了我们报告的调查结果[Proc。国家。阿卡德。科学。 USA 109, 13521 (2012)PNASA60027-842410.1073/pnas.1201345109] 用于在没有阈值的情况下通过多玻色子隧道到开放空间。
A scheme to control the many-boson tunneling process from a trap through a potential barrier to open space is devised and demonstrated. The number of ejected particles and their velocities can be controlled by two parameters, the threshold of the potential and the interparticle interaction. Employing a recently developed efficient many-body method, results for two, three, and one hundred interacting bosons in one spatial dimension can be computed numerically exactly, solving thereby an intricate problem of general interest. It is shown that the control scheme devised for the many-boson tunneling process performs very well for the dynamics of the momentum density, the correlations, and the coherence, as well as for the number of particles remaining in the trap. To interpret the many-body tunneling process, a transparent model assembling the many-body process from single-particle emission processes is derived. Analysis of the energetics of available decay channels together with the numerical results rules out the situation of two (or more) bosons tunneling together to open space. The present investigation generalizes the findings reported by us [Proc. Natl. Acad. Sci. USA 109, 13521 (2012)PNASA60027-842410.1073/pnas.1201345109] for many-boson tunneling to open space in the absence of a threshold.