Collisionally Inhomogeneous Bose-Einstein Condensates with a Linear Interaction Gradient
Collisionally Inhomogeneous Bose-Einstein Condensates with a Linear Interaction Gradient
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具有线性相互作用梯度的碰撞非均匀玻色-爱因斯坦凝聚态
DOI：
10.1103/physrevlett.125.183602
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发表时间：
2020
影响因子：
8.6
通讯作者：
Di Carli A
中科院分区：
文献类型：
--
作者：
Di Carli A
我们研究了碰撞非均匀物质波在相互作用强度的空间梯度中的演化。从准一维几何中具有弱排斥相互作用的玻色-爱因斯坦凝聚体开始，我们监测了同时扩展到具有吸引和排斥相互作用的空间区的物质波的演化。我们观察了类孤子密度峰的形成和衰减，反向传播的自干扰波包，以及孤子级联的产生。基于具有三体损耗的非多项式薛定谔方程的数值模拟很好地再现了物质波动力学，使我们能够更好地理解基于小波变换的潜在行为。我们的分析提供了对孤子崩塌过程的新理解，并为其他非线性不稳定性开辟了有趣的联系。
We study the evolution of a collisionally inhomogeneous matter wave in a spatial gradient of the interaction strength. Starting with a Bose-Einstein condensate with weak repulsive interactions in quasi-one-dimensional geometry, we monitor the evolution of a matter wave that simultaneously extends into spatial regions with attractive and repulsive interactions. We observe the formation and the decay of solitonlike density peaks, counterpropagating self-interfering wave packets, and the creation of cascades of solitons. The matter-wave dynamics is well reproduced in numerical simulations based on the nonpolynomial Schrödinger equation with three-body loss, allowing us to better understand the underlying behavior based on a wavelet transformation. Our analysis provides new understanding of collapse processes for solitons, and opens interesting connections to other nonlinear instabilities.