Dynamics of one-dimensional quantum droplets

被引：192
作者：
Astrakharchik G.E. [1 ]
Malomed B.A. [2 ]
机构：
[1] Departament de Física, Universitat Politècnica de Catalunya, Barcelona
[2] Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Center for Light-Matter Interaction, Tel Aviv University, Tel Aviv
来源：
| 2018年 / American Physical Society卷 / 98期
基金：
以色列科学基金会; 美国国家科学基金会;
关键词：
Bose-Einstein condensation - Excited states;
D O I：
10.1103/PhysRevA.98.013631
中图分类号：
学科分类号：
摘要：
The structure and dynamics of one-dimensional binary Bose gases forming quantum droplets is studied by solving the corresponding amended Gross-Pitaevskii equation. Two physically different regimes are identified, corresponding to small droplets of an approximately Gaussian shape and large "puddles" with a broad flat-top plateau. Small droplets collide quasielastically, featuring the solitonlike behavior. On the other hand, large colliding droplets may merge or suffer fragmentation, depending on their relative velocity. The frequency of a breathing excited state of droplets, as predicted by the dynamical variational approximation based on the Gaussian ansatz, is found to be in good agreement with numerical results. Finally, the stability diagram for a single droplet with respect to shape excitations with a given wave number is drawn, being consistent with preservation of the Weber number for large droplets. © 2018 American Physical Society.
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