耗散强度和相互作用强度对四重量子化涡旋分裂的影响

IF 1.1 3区 物理与天体物理 Q4 PHYSICS, APPLIED
Shanquan Lan, Jiexiong Mo, Jun Yan, Lichang Mo
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引用次数: 0

摘要

基于耗散格罗斯-皮塔耶夫斯基方程,研究了耗散强度和相互作用强度对四重量子化涡旋的线性不稳定性和分裂过程的影响。利用线性扰动理论计算出了四重量子化涡旋的基本激发模式,揭示了最不稳定模式的一个新颖而重要的动力学转变。研究发现,在较小的耗散强度下,最不稳定模是二重旋转对称模;而在较大的耗散强度下,最不稳定模是四重旋转对称模。此外,过渡耗散强度随着相互作用强度的增加而减小。全非线性数值模拟进一步证明了这种动力学转变的过程。我们的研究揭示了玻色-爱因斯坦凝聚态中一个长期存在的难题,即为什么四重量子化涡旋的四重旋转对称分裂模式尚未在实验室中观察到。我们提出了一个很有希望的方向,即通过增加耗散强度或相互作用强度来解决这个问题。我们的预测有可能在不久的将来在实验室中得到验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of Dissipation Strength and Interaction Strength on the Splitting of Quadruply Quantized Vortices

Effects of Dissipation Strength and Interaction Strength on the Splitting of Quadruply Quantized Vortices

Based on the dissipative Gross–Pitaevskii equation, effects of dissipation strength and interaction strength on the linear instability and the splitting processes of quadruply quantized vortices are studied. Using the linear perturbation theory to calculate out the elementary excitation modes of the quadruply quantized vortices, we reveal a novel and very important dynamical transition of the most unstable mode. It is found that the most unstable mode is the twofold rotational symmetry mode at a small dissipation strength, while it is the fourfold rotational symmetry mode at a larger dissipation strength. What’s more, the transition dissipation strength decreases with the increase in the interaction strength. The full nonlinear numerical simulations further demonstrate the process of such a dynamical transition. Our work has shed light on the long-standing puzzle in Bose–Einstein condensate, why the fourfold rotational symmetry splitting pattern of quadruply quantized vortex has not yet been observed in the laboratory. We propose a promising direction to solve this problem by increasing the dissipation strength or the interaction strength. Our predictions are likely to be tested in the laboratory in the near future.

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来源期刊
Journal of Low Temperature Physics
Journal of Low Temperature Physics 物理-物理:凝聚态物理
CiteScore
3.30
自引率
25.00%
发文量
245
审稿时长
1 months
期刊介绍: The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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