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One-dimensional quantum droplets under space-periodic nonlinear management
Results in Physics ( IF 5.3 ) Pub Date : 2021-01-06 , DOI: 10.1016/j.rinp.2020.103781
Junbo Chen , Jianhua Zeng

Quantum droplets have recently emerged as a novel liquid state of matter in a mixture of two-component ultracold Bose gases under the equilibrium condition between the competing attractive inter- and repulsive intraspecies forces. Quantum droplets represent a self-bound liquid state in purely nonlinear systems and as such there is not any management applied to their study up to now. We here introduce the nonlinear management via space-periodic Feshbach resonance technique to a binary Bose–Einstein condensate and investigate theoretically the structure, property and dynamics of the one-dimensional quantum droplets therein, three findings are made: small droplets with single hump (solitonlike), moderate droplets composed of two solitons, large droplets feature a modulated flat-top shape. Particularly, by means of linear-stability and direct perturbed simulations, we prove that the droplets have a much wider stable region than their counterparts without taking the nonlinear management. The variational approximation is adopted and validated with numerical results in terms of small droplets. The results predicted here may be realized in the frontier ultracold atoms experiments aided by Feshbach-resonance, opening up a new channel to the quantum droplets studies.



中文翻译:

空周期非线性管理下的一维量子液滴

在竞争的吸引种间和排斥种间内力之间的平衡条件下,量子液滴作为一种新型的液态物质出现在两组分超冷玻色气体的混合物中。量子滴代表纯非线性系统中的自束缚液体状态,因此,迄今为止,尚未对其进行任何管理。我们在这里将通过空间周期Feshbach共振技术的非线性管理引入二元Bose-Einstein凝聚物中,并从理论上研究其中的一维量子液滴的结构,性质和动力学,得出三个发现:单峰小液滴(类孤子) ),由两个孤子组成的中等液滴,大液滴具有调制的平顶形状。尤其,通过线性稳定性和直接扰动仿真,我们证明了在不进行非线性管理的情况下,液滴比其液滴具有更大的稳定区域。采用了变分近似,并用小液滴的数值结果进行了验证。此处预测的结果可能会在Feshbach共振辅助的前沿超冷原子实验中实现,从而为量子液滴研究开辟了新的渠道。

更新日期:2021-01-12
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