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arXiv 2310.02018cond-mat.quant-gasnlin.PS
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窄势垒散射中的原子孤子透射与诱导坍缩

Atomic soliton transmission and induced collapse in scattering from a narrow barrier

Francesco Lorenzi, Luca Salasnich

AI总结:

本文用三维 Gross-Pitaevskii 方程模拟亮物质波孤子穿过窄势垒,刻画透射系数与坍缩参数区,并证明耦合横向宽度动力学的修正非多项式 Schrödinger 方程可准确预测结果。

摘要:

我们利用三维 Gross-Pitaevskii 方程,对由 Bose 凝聚碱金属原子构成的亮物质波孤子穿过窄势垒的碰撞进行了系统数值模拟。由此,我们确定了透射系数如何依赖于孤子的入射速度和势垒高度。相当引人注目的是,我们还得到了碰撞诱导亮孤子发生坍缩的参数区域。我们将这些三维结果与由三种不同的一维非线性 Schrödinger 方程所得结果进行了比较。我们发现,一个经过特定修正的非多项式 Schrödinger 方程能够准确评估透射系数,即使在通常的非多项式 Schrödinger 方程确实发生坍缩的区域也是如此。特别地,这一简化但非常有效的一维模型通过一个常微分方程与 Bose-Einstein 凝聚体轴向波函数的偏微分方程相耦合,考虑了孤子的横向宽度动力学。

英文摘要:

We report systematic numerical simulations of the collision of a bright matter-wave soliton made of Bose-condensed alkali-metal atoms through a narrow potential barrier by using the three-dimensional Gross-Pitaevskii equation. In this way, we determine how the transmission coefficient depends on the soliton impact velocity and the barrier height. Quite remarkably, we also obtain the regions of parameters where there is the collapse of the bright soliton induced by the collision. We compare these three-dimensional results with the ones obtained by three different one-dimensional nonlinear Schrödinger equations. We find that a specifically modified nonpolynomial Schrödinger equation is able to accurately assess the transmission coefficient even in a region in which the usual nonpolynomial Schrödinger equation does collapse. In particular, this simplified but very effective one-dimensional model takes into account the transverse width dynamics of the soliton with an ordinary differential equation coupled to the partial differential equation of the axial wave function of the Bose-Einstein condensate.

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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